Keeping your camper van cool can be the difference between an amazing off-grid experience and sweaty nights of frustration.
With competitive price and timely delivery, Sino Air Conditioner sincerely hope to be your supplier and partner.
A common solution to temperature management in campervans and RVs is the ever-popular 12v DC air conditioner. These compact, energy-efficient units are specifically designed to run on your van batteries 12V DC power.
In this guide, we’ll cover everything you need to know about choosing, placing, and wiring 12V air conditioners, along with key power considerations and helpful tips to get you going.
Let’s drive in.
12V battery-powered air conditioners are low-voltage cooling systems designed to work on the 12V DC system of your van’s leisure battery.
Unlike traditional high-voltage AC air conditioners, they can be run off-grid using standard electrical systems, making them perfect for enjoying a cool night out in the wild.
12V camper air conditioners are also designed for compactness and energy efficiency, making them ideal even for smaller campervans with tight spaces and smaller batteries.
As you might have guessed, they consume significantly less energy than their high-voltage counterparts, using small DC compressors to generate amazing cooling without needing shore power or dedicated generators.
To get the most out of a 12V air conditioner, you’ll need to take a few factors into consideration. Read on to learn more.
Common types include:
There’s no point splashing out on the best 12V air conditioner money can buy if your van isn’t properly insulated. Good insulation is crucial to keeping your camper van cool, and without it, much of the cold air generated by the unit will escape. This makes the unit work harder leading to increased power consumption, less running time off-grid, and increased wear.
Conversely, proper insulation in your walls, floors, and windows will reduce your cooling needs and extend the life of your battery.
Proper airflow throughout your van is also vital to effective cooling. Be sure to factor in venting to your build, ensuring the vents are strategically placed to let cool air circulate efficiently. Without this, pockets of hot air can form around the van, reducing the effectiveness of your air conditioner.
Once these challenges are tackled, it’s time to move on to the fun part: electrics!
Successfully wiring in your 12V air conditioner needs careful planning to ensure it works properly and compliant with wiring safety regs like BS Electrical standards.
Tools you’ll need:
Without further ado, here’s a step-by-step guide to wiring your system.
Before starting the wiring process, it’s important to assess the power draw of your air conditioner. The formula for this is A (Amps) = W (Watts) / V (Voltage).
You can use this to calculate current draw by dividing the watts drawn by 12 to work out the amperage of the system.
For example, a W 12V air conditioner will draw about 150A of power from the battery (W ÷ 12V = 150A).
It’s crucial to make sure that the battery, wires, and fuses in your circuit can safely handle this load.
Wires are rated based on how much current they can carry. This is calculated based on their cross-sectional diameter and the material they’re made of.
We’ll assume you’re using regular stranded copper wiring due to it being the most common type, both due to its low cost and flexibility (which makes it great for stuffing behind camper van interior panelling).
Be aware, getting this wrong and using too small of a wire can lead to significant safety concerns including overheating and fires.
For that reason, we don’t use the minimum possible sizes. Instead, we use thicker wires to increase the safety margin and avoid voltage drop.
For our example current of 150A, a standard gauge wire (SWG) of 8.mm is recommended for short distances of around 10 metres. For our transatlantic cousins who insist on the imperial system, that’s equivalent to 1/0 in American wire gauge (AWG).
In addition to the right wire gauge, fuses further prevent your electrical system from fires when the current exceeds a safe threshold.
That means the fuse needs to be rated lower than the power your wiring can carry, but higher than the draw of your air conditioner.
For example, for our 150A power draw, you should use a 200A fuse, with the wire being rated to around 250A to ensure safety.
These will be bigger than the standard blade fuses found in your glove box, which brings us to the next section.
Most campervans will use a regular 12V fuse box for regular appliances like LED lights and a minifridge, but your air conditioner will usually require its own circuit due to the higher current that is drawn.
For units pulling more than 100A, you’ll need dedicated mega or midi fuses in their own fuse holder sat in between the wiring from your AC unit to the battery.
Ensure this is easily accessible in case you need to replace the fuse in the event of a surge.
Here’s a simple 12V Campervan wiring diagram to help:
Bus bars distribute power evenly across multiple circuits. This is important as you’ll probably be powering more than one device from your 12V leisure battery.
Connect your air conditioners’ positive and negative wires to the right bus bars and install an appropriate breaker in the system for easy shut-off.
Logic would dictate that you need a 150A breaker for a 150A power draw, however, breakers can generally only handle around 80% of their actual rating.
That means a 200A breaker is actually more suitable for a 160A circuit, ideal for the 150A power draw of our example air conditioner.
Once you’ve got everything wired up, test your system using a multimeter to make sure the current readings are within safe limits.
Double-check for safety by ensuring there’s no excess heat coming from any of the connections or wiring after running the air conditioner for a few hours.
Once this is complete, you’re all set!
In addition to choosing the right 12V air conditioner based on placement, there are a couple of other factors to consider. These include:
BTU rating. The cooling capacity of an air conditioning unit is measured in BTUs. This is essentially the amount of cooling power it can generate. The bigger your van’s interior, the more BTUs you’ll need. As a rough guide, small vans with a volume of 6 cubic metres might need a unit with 7,000 – 9,000 BTUs, while the biggest vans might need well over 10,000 BTUs.
Energy efficiency. Choose a unit that offers the highest energy efficiency available for your budget. This is measured in what’s called EER (Energy efficiency ratio). The higher the EER, the more efficient the 12V air conditioner, meaning it will draw less power from your battery
12V air conditioners. As we’ve discussed, these run straight from your van’s battery, making them perfect for off-grid camper van use. They’re also generally more energy efficient and use less power versus 230V units. However, there is a trade-off and 230V units are usually more powerful.
230V air conditioners. These units are generally more powerful and can cool bigger vans quicker. They need a 230V power supply to work which usually requires an inverter to convert the current from DC to AC. They’re more suitable for vans that can regularly recharge with shore power.
Your battery’s overall capacity is crucial when choosing a 12V air conditioner as it dictates how long the air conditioner can run when off-grid. For example, a 12V air conditioner drawing 100 amps can run for 4 hours on a 400Ah battery in eco mode. For higher power modes this runtime would be much shorter. This is why a high-capacity battery bank is essential for powering a 12V air conditioner off-grid for extended periods, such as overnight use.
Lithium Iron Phosphate (LiFePO4) batteries are usually the go-to due to their high efficiency, low weight, and better discharge capability compared to traditional AGM batteries.
You’ll want the highest Ah rating LiFePO4 battery that cost, space, and weight can allow for to provide the highest runtime possible, especially when running an air conditioner off-grid for extended periods.
You can also adjust the power settings on many modern 12V air conditioners to suit your recharging situation, with many offering eco and power modes. On the eco setting, some can draw as little as a quarter of the power as when they’re on power mode.
It’s important to match this power consumption to your battery’s capacity to avoid depleting your battery too quickly. Let’s look at some common scenarios to get a better understanding of how this looks in real-world terms.
Battery capacity: 200Ah
Usage: 1 hour/day
Off-grid time: 4-5 days
Battery capacity: 300Ah
Usage: 1 hour/day
Off-grid time: 3-4 days
Battery capacity: 400Ah
Usage: 1 hour/day
Off-grid time: 2-3 days.
It’s also worth considering how the battery will be charged. In general, there are three different methods to achieve this, which can be combined with one another:
Solar charging. With the cost of solar panels dropping in recent years, it’s common for camper vans to convert sunlight into electricity to recharge leisure batteries. MPPT controllers are better for this as they’re more efficient than PWM controllers.
Split charging. Split charging relays (SCRs) connect to your campervan’s alternator to charge the leisure battery while driving. There are also DC-DC chargers which are more efficient and ideal for newer vans with smart alternators. These can also cater to solar input to combine alternator charging with solar input.
Shore power. This uses an onboard mains charger to recharge your battery by connecting to electrical hookups, such as those found at campsites. Alternatively, portable generators can recharge your battery. These are great as a backup when you’re off-grid and there isn’t enough sunlight.
For off-grid charging, solar is ideal and you can be more lenient when making your power calculations as solar panels will help offset the air conditioner’s power consumption during the day.
The exact number and size of panels you’ll need will depend on your overall energy needs and the amount of available flat space on your van’s roof. You’ll also need to factor in the additional power systems required to integrate solar charging into your setup.
While 12V air conditioners are popular, there are alternatives available. These include:
Portable AC units. These run off a 110V or 230V power system and generally require an inverter to use. They’re not as efficient as 12V units but can be a good option if you normally stay at campsites where shore power is available.
Evaporative coolers. These consume less energy than traditional air conditioners and work by pulling in warm air and passing it over water-saturated pads to cool it before recirculating. This works best in dry environments and isn’t suitable for travel in humid regions.
Ventilation and fans. This also consumes much less energy than air conditioning units, relying on simple airflow increases through vents, windows, and fans. This method helps to exhaust hot air and bring in cooler air but won’t achieve anywhere near the same level of cooling as an air conditioning unit.
Pricing for 12V air conditioners depends on the type of unit, along with its size and the brand you choose. As a rough guide:
Portable 12V Air Conditioners. Typically cost between £400 – £ depending on capacity. Some are only suitable for small spaces and have limited power modes.
Roof-Mounted 12V Air Conditioners. The most common type of 12V air conditioner, these usually cost between £ and £, with large premium units coming in at well over £.
Evaporative Coolers. Generally more affordable, these cost anywhere between £500 – £ and are great for saving money in dry climates.
Installing a 12V air conditioner can drastically improve your comfort during hot weather adventures, and the wiring process can be a particularly rewarding introduction to electrical systems.
If you’re in the process of combing through forums and piecing together a shopping list of components, why not use Vunked’s simple builder to build the perfect kit for your project? You’ll receive full wiring diagrams and detailed installation instructions.
Take the stress out of camper van wiring with our online tool that helps you choose the right parts for your build. You’ll get every bit and piece you need, along with the peace of mind of knowing your system is up to professional wiring and safety standards.
Maintenance is key to keeping your 12V air conditioner working properly. Regularly clean the filters and inspect the wiring for any corrosion or damage and to check the refrigerant levels to keep your system running efficiently. You should also be sure to follow the manufacturer’s instructions when doing your annual checks.
Yes, you can run a 12V air conditioner off solar power. However, you need to make sure your solar system and battery capacity are in line with the energy requirements of the unit you choose.
Large solar setups of 500W-W combined with a high capacity LiFePO4 battery should be ample to run energy efficient units during the day time. Just be sure to calculate your overall daily energy consumption and balance it with the amount of input your solar set-up provides.
The lifespan of your 12V air conditioner will depend on the unit’s build quality and how often you use it. It’s also important to maintain it according to the manufacturer’s guidelines to get the most out of your purchase. High-end units from reputable brands can last up to 15 years.
Picture this: it's a sweltering summer day. The kind where the sun beats down mercilessly. You're in your campervan, parked under the blazing sun with not a speck of shade in sight. Inside, it feels like you've accidentally parked in an oven rather than a picturesque spot by the lake. The heat is overwhelming. The fridge runs at full power, yet your favourite cheese is melted. You’re covered in sweat, craving a cool breeze.
Here's where the hero of our story comes in – the mighty 12V air conditioner. These compact lifesavers are the perfect addition to any campervan or RV, turning your mobile abode from a sauna into a serene retreat. In this article, we'll guide you to select the perfect 12V A/C unit for your needs and compare the best brands. You’ll also understand how DC air conditioners work, how to install them and how to ensure their longevity through proper care and maintenance.
Shane, the founder of The Van Conversion, is a campervan professional and NCC-certified electrical installer. Since , he’s lived on the road full-time, completing several van builds along the way. He’s the author of Roaming Home and the creator of The Van Conversion Course, which have helped thousands build their own vans. Shane also writes The Van Conversion Newsletter, where he shares hands-on tips and practical insights. He’s passionate about empowering others to make their vanlife dreams reality.
This post contains affiliate links, which means that if you click a product link and buy anything from the merchant (Amazon, eBay, etc.) we will receive a commission fee. The price you pay remains the same, affiliate link or not. By using these links, you are helping us to continue writing free educational content. To understand our policies on content, affiliate commissions, and liability, please review our Terms of Use.
Did you know you can get a free electrical wiring diagram by signing up for The Van Conversion Newsletter?
Why Choose a 12V Air Conditioner?
Understanding 12V Air Conditioning Systems
Price Range and Budgeting for Your DC Air Conditioner
Estimating Power Usage and Battery Requirements for a 12V A/C
Evaluating Effectiveness: BTUs vs. Van Size
Best 12V Air Conditioner Units
12V Cooling Alternatives to Traditional Air Conditioning
Installation Guide for 12V Air Conditioning Units
Service and Maintenance for your 12V Air Conditioner
Sustainability and Off-Grid Potential in a Campervan
Final Thoughts
If you are in a rush and are looking for the best 12V air conditioner overall, our top pick is the Nomadic Cooling X2.
We like the Nomadic Cooling X2's compact size and relatively modest eco mode power consumption of 27A.
We also love the Indel-B Plein Aircon, from the same company that makes Webasto's excellent air and water heaters.
The Plein Aircon uses even less power than the Nomadic Cooling X2 at 16A on eco mode, and shares the former's small form factor.
Best portable air conditioner (updated ):
Zero Breeze just released their Mark 3 unit and it packs a punch!
You can read our full hands-on review of the ZERO BREEZE Mark 3 here.
If you’re looking for a truly portable air conditioning solution without permanent installation, the Zero Breeze Mark 3 is a serious contender. Weighing just 22 lbs (10 kg) and delivering 5,280 BTU of cooling power, it’s the most compact and powerful battery-powered unit by a mile. It cools spaces up to 150 ft² (45m²) and drops the temperature by 20°F (6°C) in just 5 minutes.
The battery-powered setup (Wh) offers up to 7 hours in sleep mode, and supports solar, wall, or vehicle charging.
Power draw is just 150W–500W, making it feasible for minimalist electrical systems. It’s expensive, yes—but if you need serious cooling on the go, the Mark 3 is in a league of its own.
When outfitting your campervan for the perfect road trip, one of the key decisions you'll face is choosing between a 12V and a 110/220V air conditioning unit. So, why opt for a 12V model?
The answer lies in the DC air con’s higher compatibility with an RV electric system and its affinity with a campervan lifestyle. It's all about balancing efficiency, convenience, and the specific needs of your home-on-wheels.
By the way, if you’re confused about AC vs DC electrical systems, check out our post Campervan Electrics Explained. Also, don’t be misled by similar acronyms: AC means both Alternate Current (found in homes and provided by power inverters) and Air Conditioner (often spelt as A/C). Just mind the context.
As for the difference between 110V and 220V, for the purposes of this post, it will suffice to say that it depends on the country. Both are considered standard home voltages in different parts of the world.
Source: https://wikitravel.org/en/Electrical_systems
Tailor-made for the nomadic lifestyle, in a 12V air conditioner, DC (Direct Current) operates the unit seamlessly with your van's 12V electrical system. This synergy is what makes them ideal for keeping you and your van cool on the road.
Unlike household 110/220V units, which require a constant high-power source (in an RV, that’s provided by an inverter, but for an air conditioner you’d need a big one) 12V cooling systems can run efficiently on your van’s leisure batteries.
This means that you can keep your RV cool even in remote locations without access to shore power. Additionally, 12V and portable AC units are typically more compact and easier to install, making them suitable for the limited space in a motorhome.
They're also generally quieter, ensuring a peaceful environment. While 110/220V AC units might offer more cooling power, they are less practical for the often off-grid, space-conscious nature of van life.
In essence, a 12V air conditioner aligns perfectly with the ethos of freedom and self-sufficiency that many van lifers and RV’ers cherish.
Here’s a useful feature table comparing 12V Air Conditioners with 110V-220V Air Conditioners:
Venturing into the world of 12V cooling systems brings its own set of challenges and choices. When you're outfitting your campervan for those dreamy road trips it’s useful to understand their functioning. When you know how something works, it’s easier to install, maintain, and fix it.
DC air conditioners are marvels of engineering, designed to bring the comfort of a cool breeze to the compact space of a motorhome. But how do they work their magic?
In a 12V air conditioner, DC from your van's batteries powers the unit. Because DC air con systems operate with a lower voltage than their AC counterparts, they consume less energy. This is crucial in a motorhome setting where power resources are limited.
The technical magic lies in their ability to efficiently convert the 12V power into a cooling force, using compressors and refrigerant gases. In this, they mirror the basic principles of traditional air conditioning.
The compressor circulates the refrigerant through a closed loop which goes through 4 stages.
Air Purification and Water Generation Using a Compression Refrigeration System – Scientific Figure on ResearchGate.
Absorption: The refrigerant, initially in a low-pressure gaseous state, absorbs heat from the van's interior as it passes through the evaporator coils. This process effectively removes heat from the air, thereby cooling it.
Compression: The now-heated refrigerant gas is then compressed. This action increases the refrigerant's temperature and pressure, preparing it for the next crucial step – condensation.
Condensation: In the condenser coils, usually located outside the van (except in portable systems), the hot, pressurised refrigerant releases its absorbed heat to the outside air. This causes the refrigerant to cool down and condense into a liquid form, completing the cycle.
Return: Finally, the refrigerant, now cooled and in a high-pressure liquid state, returns to the evaporator where the cycle begins anew.
The world of DC air conditioners for RVs offers a variety of options to cater to the diverse needs of vanlife enthusiasts. Each type boasts unique features and benefits, making it important to understand your specific requirements before making a choice.
Here's a brief overview of the most common types:
Rooftop A/C Units: These are the most popular choice for full-time vanlifers. Mounted on the roof, they save precious interior space. They're ideal for larger campervans and motorhomes. However, they require you to cut into your van's roof and seal the opening around the unit.
Portable A/C Units: For those who seek flexibility, portable air conditioners are a great choice. They can be moved around easily and used outside the van as well thanks to their rechargeable batteries. They're perfect for those who only occasionally need air conditioning and are becoming increasingly popular.
Window A/C Units: Similar to traditional home air conditioners, these can be fitted into a window space of the van. While they can be more affordable, they require a suitable window and can take up more interior space.
Split A/C Units: These systems have separate indoor and outdoor components, connected by a hose, similar to household ones. They offer efficient cooling and are quieter inside the van, but require a more complex installation.
Under-bench A/C Units: These are compact and installed under a bench or bed. They're a discreet option that doesn't alter the van's exterior, making them ideal for stealth camping.
Undermount A/C Units: Perfect for stealth camping, this type of air conditioner is installed under the chassis of your campervan. This also saves roof space for your solar panels.
Note: some models may come in 24V versions too. To use them, your battery array must be set up in series to deliver higher voltages. Check out our post Campervan Electrics Explained for more details.
Each type of 12V air conditioner has its pros and cons, so it's important to consider factors like your van's size, your travel habits, and your budget. Whether you prioritise efficiency, space, flexibility, or stealth, there's a 12V cooling solution out there to meet your needs.
When considering a 12V air conditioner for your campervan, it's worth exploring models that offer heating capabilities, too. This is especially true if you plan to travel in cooler climates or during the winter months and you don’t have other heating systems.
Some modern 12V air con units come with built-in heating abilities, providing a dual function that makes them a versatile choice for year-round comfort.
Even in relatively cold temperatures, a 12V air conditioner with heating capabilities can effectively warm your space, making your van a cosy refuge against the chill. Imagine enjoying the beauty of frosty mornings and snowy landscapes from the comfort of your warm, snug van.
Investing in a 12V air conditioner with heating may eliminate the need for a separate heating system such as a diesel heater, saving space and simplifying your setup. However, you have to manage power consumption well – more about this below.
It goes without saying that when planning to add a DC air conditioner to your mobile home, it's crucial to consider the financial aspect. The price range for 12V A/C varies widely, depending on the type, brand, and features.
Basic models can cost around one thousand pounds/dollars/euro, while more sophisticated units with additional features like heating capabilities and advanced energy efficiency can cost a few thousand. They’re not cheap, but they’ll make a huge difference in your van life.
Budgeting for your air conditioner involves more than just the purchase price. Consider accessories and installation costs, especially if you're not doing it yourself. Also, factor in potential upgrades to your van's electrical system, such as additional batteries or solar panels, to support the extra power load. Use our electrical load calculator to understand how much your chosen air conditioner will affect your electricity usage, and then use our battery size calculator and solar panel calculator to spec these components based on your usage.
You can view the purchase of a DC air conditioner for your campervan as an investment in your comfort on the road. Even more so if you’re planning to permanently move into your motorhome or spend the summer months in it.
While it might be tempting to go for a cheaper model, investing in a reliable, efficient unit can save you money in the long run. Balance your immediate budget with your long-term needs to find the best option for you. Check our recommended models below.
The best time to buy an air conditioner – whether it’s 12V or 110/220V – typically aligns with the seasons when demand is lower. This means late winter to early spring is an ideal period.
Here is some Google Search data across the years. Unsurprisingly, the graph shows that demand for air conditioners is cyclical and follows the temperatures. A Forbes article confirms this trend.
Source: https://trends.google.com/trends/explore?date=all&q=air%20conditioner&hl=en
During these months, retailers often clear out last year's models to make room for new inventory, leading to attractive discounts and promotions.
Waiting for seasonal sales events, like Black Friday, Cyber Monday or end-of-season clearances, can also yield significant savings.
However, it’s important to balance the timing with your personal needs. If you require an air conditioner due to immediate climatic changes or an unexpected trip, it might be prudent to purchase outside of these ideal windows.
One of the most critical aspects of integrating a 12V air conditioner into your RV is understanding and estimating its power usage and the corresponding battery requirements.
A much-needed premise here is to understand that air conditioning units are generally power-hungry devices. While the unbearable heat might tempt you to keep them running for many hours and at full power, you have to manage your expectations.
A general rule of thumb is to never set them to the lowest temperature, otherwise, the duty cycle will be very long. Only a few degrees lower than the inside temperature might be enough to cool you down for many hours without draining your batteries.
Now let’s get to the maths. Estimating the power usage is crucial to ensure your van’s electrical system can support the air conditioner without draining your battery. For your calculations, always keep in mind the basic formula Watts = Amps x Volts.
Here is a practical guide:
First, consider the power consumption of the air conditioner, usually measured in watts. The more powerful the unit (in terms of BTUs), the higher the power consumption will be.
Divide that time by 2. This is a rough estimate that factors in the duty cycle, that is, the time the compressor actually works*. This will give you an approximate consumption in watt-hours (Wh).
Check your van's leisure battery capacity, which is measured in amp-hours (Ah).
Divide the unit's adjusted wattage by 12 volts (or 24 volts if that’s your case) to find out how many ampere-hours (Ah) it consumes every hour.
Divide the battery capacity by the air con power consumption in Ah and you’ll get the number of hours you can keep it on uninterruptedly.
*The duty cycle can vary significantly based on numerous factors, including the type of air conditioner, outside temperature, desired interior temperature, and efficiency of the unit. However, for many air conditioning systems, including those used in campervans, a rough estimate is that the compressor might be active for about 40% to 60% of the time under normal conditions. This is why we suggest dividing by 2.
For example, if your air conditioner is watts and your system is 12V, it would use 50 A per hour (W ÷ 2 = 600W; 600W ÷ 12V = 50Ah). If your battery’s capacity is, say, 200Ah, it can sustain the air conditioner for about 4 hours (200Ah ÷ 50A/hour).
Battery sizing can be confusing. Our electrical load calculator is an easy way of estimating your daily electricity usage. Once you have this figure, it's easy to use our battery sizing calculator to figure out the battery that best suits your needs.
Now that you’ve calculated the power consumption of your 12V air conditioner and its battery requirements, it’s time to include your solar array in the equation.
Solar panels (and an optional DC-to-DC battery charger, if your engine is running) recharge the battery during daylight hours, extending usage time. The recharging speed depends on the size and efficiency of your solar setup.
If your panels, through the charge controller, can recharge your batteries at say, 40Ah, then, in our example, you would be using only 10Ah (50 - 40 = 10Ah). However, your batteries won’t be charging at all. Actually, they would be discharging, unless your charging power is greater than the air con consumption.
Also, keep in mind that we’ve theoretically considered the air conditioning unit as the sole appliance in use. More realistically, you have to factor in the other appliances’ consumption to find out the total power you will use.
These kinds of calculations tend to become inaccurate as it’s hard to estimate correctly your hourly or daily power requirements. Remember, it's always good to have a buffer in your calculations for efficiency losses and unforeseen power needs.
To make your (van)life easier, we have built an energy consumption calculator that can help you calculate your total power consumption, battery capacity and solar panel size.
If your current battery setup isn't sufficient, you might need to consider upgrading to a higher-capacity battery or installing additional batteries. Our post A Complete Guide to Campervan Leisure Batteries will help you deal with that.
Note: Even though it’s safe to discharge lithium batteries completely and they don’t have a memory effect (the phenomenon where a battery seems to "remember" its previous level of charge if consistently recharged from a partial discharge, leading to reduced capacity over time), you don’t want to completely drain them or you won’t have any power left for your 12V appliances. This is even more true for AGM batteries or other kinds that might be damaged when drained. If your battery doesn’t have a built-in low-voltage alarm, you should get yourself a battery monitor with a sound alarm.
Another option to expand your setup is to increase your power supply with bigger or additional solar panels. This way, you can provide extra power to run your air conditioner during sunny days, thereby reducing the load on your batteries.
Wondering how to charge your batteries also on cloudy days? You can install a split charger (also known as DC-to-DC or B2B – battery to battery – chargers). In this way, your battery will charge while you’re driving. So that when you park, you can enjoy your air con.
When selecting a 12V A/C system for your campervan, one of the key factors to consider is the balance between the unit's cooling capacity, often measured in British Thermal Units (BTUs), and the size of your van.
The general rule of thumb is that a larger van will require an air conditioner with a higher BTU rating to cool the space effectively. However, choosing a unit with too high a BTU rating for your van's size can lead to unnecessary power consumption and inefficient operation.
On the other hand, a unit with too low a BTU rating might struggle to cool your space adequately, especially on particularly hot days. This can also result in the compressor running for longer times, increasing power consumption.
As a guide, a small van might only require an air conditioner with a BTU rating of around 4,000 to 7,000, while a large motorhome or one with a high roof and more internal volume might need a unit with 10,000 BTUs or more.
Here’s a useful table to estimate how many square metres or feet each BTU range can cover efficiently. Find your van's size in the orange (sq ft) or blue (sq m) bars and check below what BTU rating you need.
As a convention, BTUs are measured against square metres or feet instead of their cubic counterparts because it's the most common form to measure interiors. Note: These values are estimated. The right BTU for your rig might vary depending on many factors.
For instance, if your campervan is 10 square metres (108 square feet), the recommended BTU rating for an air conditioner is 8,000, regardless if it's 12V or 110V-220V.
It's also important to consider factors such as insulation, window size, and the typical climate you'll be travelling in, as these can all impact the effectiveness of your air conditioning unit.
Selecting the right BTU rating for your van's size and travel needs will ensure that your DC air conditioner provides a comfortable environment, efficient and economical, no matter the weather outside.
Selecting the best DC air conditioner for your RV can be a daunting task, given the myriad of options available. To help streamline your decision-making process, we've compiled a list of the top DC A/C units. This selection is based on a range of factors including efficiency, reliability, features, and user reviews.
When it comes to 12V air conditioners for campervans, the Nomadic Cooling X2 and Indel-B Plein Aircon are clear winners.
Despite its compact size – it’s 40% smaller than its competitors – the Nomadic Cooling X2 is packed with 8,188 BTU of cooling power. That’s enough to significantly cool down medium-sized vans and RVs even in hot temperatures.
It also features a silent fan with an adjustable vent that ensures optimal air circulation. Its lightweight design and aerodynamic shroud mark it as one of the smallest air conditioners available. So you have more roof space for your solar array.
The X2 is quite straightforward to install, fitting an industry-standard 35.5 x 35.5 cm (14 x 14 in) opening. It comes with a modern control panel featuring five operation modes.
With its extraordinary blend of power, user-friendliness, and efficiency, the Nomadic Cooling X2 is set to turn summer vanlife into a chilled haven. Also comes in a 24V version.
Pros:
Powerful and fast cooling even in hot and humid climates.
High energy efficiency and low consumption.
Compact, lightweight and aerodynamic.
Relatively quiet operation.
Reliable brand: Nomadic Cooling is a specialised air con manufacturer.
Standard roof fan hole size.
For more information, please visit 12v Air Conditioner.
Cons:
The initial investment is not cheap but it will pay off over the years.
The Indel-B Plein Aircon is another air-con unit designed specifically for campervans. It's slightly bigger than the Nomadic Cooling X2, but boasts the same in-built compressor and inverter plus quiet-running fans.
The Indel-B Plein Aircon differentiates itself with its low power usage; when running on eco mode, it only uses 16W. This comes with a tradeoff in cooling power, as the unit only outputs BTU on its maximum setting. Indel-B suggest, therefore, that it's only suitable for vans up to 6m in length.
Finally, the Indel-B Plein-Aircon comes with bluetooth connectivity as standard, meaning you can set up and control the unit from your .
Key Feature
Description
Price
£1,998
Cooling Power
4,100 BTU
Energy Draw
16A in Eco mode; 42A in Max mode
Dimensions
80cm x 67cm x 24.6cm
Weight
26kg
Noise Emissions
< 55 dB
Mount Type
Rooftop
The Dometic RTX stands out among DC air conditioners for its great value and reliability. Dometic is the outdoor-focused branch of Electrolux, a world-recognised manufacturer of home appliances with decades of experience.
This self-contained marvel showcases a great blend of cooling power, energy conservation, ease of installation, and exceptional value for the money.
Equipped with 6,824 BTU – almost 3,000 more than its lower sibling RTX – it ensures a comfortable and cool environment inside small and medium-sized vans. It features both an Eco mode – so you can keep it running overnight – and a Boost mode that will cool down your RV in record time.
Its innovative speed-controlled inverter compressor reduces energy consumption while producing little vibration. Despite that, when running at full power it can be slightly loud. While Dometic RTX might be the perfect choice for campervans, big motorhomes might need more cooling power – read below.
Pros:
Dometic is a solid brand (owned by Electrolux) with over a decade of success and great reviews.t
Good cooling power thanks to a variable-speed inverter compressor.
Excellent value compared to its competitors.
Extended running time and reduced energy consumption.
Ease of installation.
Cons:
Might not suit the cooling needs of big vans and motorhomes.
Accessories and original mounting kit/wiring might be pricey.
The compressor is not very silent.
The Nomadic Cooling X3 has been meticulously engineered to cater to the needs of full-time Vanlifers, RV’ers, and those looking for ultimate off-the-grid comfort. Despite being compact, this air conditioner offers one of the highest cooling power on the market with a whopping 11,830 BTU rating.
Thanks to a long-lasting brushless internal fan and an intelligently redesigned LCD board, this unit offers a superior cooling experience. The compressor, mounted on spring bushings, ensures durability and resilience against road and operational vibrations.
This air con is the best choice for big vans and RVs. Or, for those who like their recreational vehicle super cool also in extremely hot temperatures. It’s worth noting that the noise emission is not so high, considering its impressive cooling power.
However, all this power comes at the expense of the final price and energy draw. So make sure your electrical system (and wallet) can support it. There’s also a 24V version with an even higher BTU rating (12,480) and smaller amperage.
Pros:
Very powerful. It can quickly cool down big volumes.
Compact and lightweight, despite its power.
Reliable and durable thanks to the spring bushings.
Clear visibility and user interface of the LCD control panel.
Cons:
A bit pricey (but you get what you pay for).
Requires big batteries and solar panels to run for long periods.
The B-Cool RV Air Conditioner is a state-of-the-art cooling solution for your RV and van. With an impressive cooling power of 11,253 BTU – one of the highest in its category – this unit guarantees a comfortable and cool environment for big motorhomes and RVs, even on the hottest days.
The main highlight is its extremely silent operation, compared to its competitors. As quiet as a whisper, the B-Cool RV ensures you’ll have peaceful and quiet nights in your on-the-road adventures without compromising cooling capacity.
The unit fits perfectly into a standard 35.5 x 35.5 cm (14 x 14 in) install hole, making it an ideal replacement (or addition) for traditional ceiling fans in campervans.
Ready to go right out of the box, the B-Cool RV includes an easy-to-install system, complete with a ready-to-connect wire harness, fuse block, and battery cables. Also comes in a 24V version.
Note: Noise can be louder in smaller, enclosed spaces, so the unit's placement can also affect the perceived noise level. Below is a table of common noise levels for reference:
Source: webmd.com
Pros:
Super quiet. Its noise emissions are the lowest in its category.
Very powerful. It can quickly cool down big volumes.
Easy to install; comes with an installation kit.
Standard roof fan hole size.
Cons:
A bit power-hungry: needs an adequate electrical system.
Heavier than its competitors.
The Zero Breeze Mark 2 battery-powered portable air conditioner has a revolutionary concept. Air conditioning on the go, wherever you are. This means, both indoors and outdoors. This compact powerhouse is a game-changer for those seeking relief from the sweltering heat.
While its BTU cooling capacity doesn’t match those of fixed models, this unit impresses with its flexibility. Small vans can still greatly benefit from its pioneering technology.
Whether you’re up for a picnic near the lake or a beach day, the Mark 2 can follow you and create a refreshing oasis for up to 5 hours thanks to its 24V battery.
The battery can be recharged by connecting the included power adapter to shore power or by using the dedicated 100W solar panels, for a full off-grid experience. If your electrical system is 24V, you can avoid buying the Zero Breeze battery and connect it directly to your van’s leisure batteries.
Got a 12V system? No problem, just buy the optional 12-to-24v converter. Needless to say, energy efficiency (only 240W) is a must for a high-power appliance that runs on batteries. The long list of accessories (a bit pricey though) tops off its ultra-portable character.
Also featuring a cool design, this little gem of technology is the perfect companion for all your outdoor activities.
Zero Breeze have given readers of TheVanConversion.com a special discount: get $100 OFF on Mark 2 AC or ElecHive with the code: 'TVC''
Pros:
High portability and versatility thanks to its battery and accessories.
Long battery life.
Installation free.
Beautiful design.
Durable construction materials.
Cons:
Pricey when including a battery and some accessories.
Some users find it a bit heavy when using the provided battery.
Can’t be charged directly with the 12V cigarette lighter plug (though you can purchase a 12V to 24V cigarette plug adapter to fix this!)
There are not many 12V A/C units that offer both rapid cooling and heating. EcoFlow Wave 2 does. And at a great value. What’s more, it’s the world's first wireless portable AC with heating capabilities. It’s a dream come true!
Even though it’s a portable model, its impressive BTUs of cooling and BTUs of heating capacity are almost on par with fixed models. Plus, you don’t need any installation, not even for a cooling drainage pipe.
You can charge it using various methods, including AC, solar or the 12V cigarette lighter plug, offering unparalleled flexibility. Another amazing perk is its wireless connectivity: you can control it from your smartphone with a dedicated app. This is flexibility at its top.
Pros:
Effective cooling and heating in the same unit.
Impressive battery life.
Great value, especially considering the dual function.
Eco-friendly R290 refrigerant.
Can be charged from a 12V cigarette lighter plug.
No installation and no drainage pipe (in cooling mode).
2.4G Wi-Fi and Bluetooth for smartphone control.
Cons:
The heating mode cannot be activated at temperatures lower than 5 °C / 41 °F.
Quite heavy.
Not super-quiet operation
Meet the Velit U, a compact DC-powered under-bench air conditioner. Hiding under your van’s furniture, this unit is the perfect option for stealth campers and anyone who wants to save roof space for their solar panels or storage racks.
Installing it is a breeze, and its versatile design fits snugly into the majority of floor plans. Powered by a twin-cylinder rotor compressor, this nifty appliance can keep you chill even in very hot climates without the need for a massive inverter, unlike traditional RV air conditioners.
Don't let its compact size fool you. The Velit U packs a punch with a cooling capacity of 8,000 BTU, enough to cool down a medium-size van effectively. Featuring Eco and Boost modes, this air conditioner has a small energy footprint, with a maximum rated power of 700W, without compromising performance.
This model is also available in the 24V version.
Note: This model is only available as a pre-order with a refundable deposit of $500.
Pros:
Compact, stealth and space-saving design.
Easy installation and user-friendly controls.
Energy-efficient cooling performance.
Fast shipping thanks to warehouses both in the UK and the US.
Cons:
Pre-order only.
Slightly noisy compressor.
Designed for use in challenging conditions, the Cruise N Comfort USA HD-12L is a 12V mini-split air conditioner. The remote condenser can strategically be placed outside your RV or campervan, keeping noise at a minimum and freeing up internal space.
Splitting the two main units of the AC – condenser and evaporator – also results in high energy efficiency and easier maintenance.
Need a recharge? No problem – R134a automotive-style service ports make maintenance a breeze. This cool-only powerhouse delivers 10,000 BTUs of cooling comfort with low power consumption.
Cruise N Comfort has been manufacturing the HD (Heavy Duty) series in-house since . It's not just tough; it's built to last with its stainless steel construction and enamel-coated evaporator. The same materials they use to produce air conditioning units for the United States Navy and Army patrol boats.
Also available in a 24V version.
Pros:
Built tough: made with heavy-duty materials.
Installation flexibility: the two units can be placed in various positions.
Reduced noise thanks to the condenser unit mounted outside the living space.
High energy efficiency and cooling performance.
Cons:
Pricey. It's an investment, but you're paying for quality and durability.
Not as easy to install as other models. You might need a professional’s help.
Looking for a 12V air conditioner that keeps you cool and doesn’t break the bank? Totally understandable. But try to stay away from low-quality solutions that you can find on Alibaba, Amazon or eBay from some unknown brands. You get what you pay for.
We’ve searched far and wide but we don’t feel comfortable recommending products that have reviews of water leakage, broken compressors, blown motherboards and so on. You could get lucky and find a product that works for some time. Or, be left with an unusable product right when you most need it and elusive customer support to deal with.
You might be tempted to go for $800-900 air conditioners and save some bucks but consider that if it breaks down quickly you’ll have wasted that money. Instead, go for a smaller unit from a reputable brand. At the time of writing, the cheapest option is the EcoFlow Wave 2. Do yourself a favour and invest in a reliable product.
If installing a 12V air conditioner in your campervan doesn't align with your needs or budget, there are several alternative DC cooling options to consider. These alternatives can offer comfort during warmer weather without the complexity or cost of a full air conditioning system.
Fans: A simple and effective way to improve air circulation within your van. Fans come in various types, including ceiling fans, oscillating fans, and portable fans such as neck fans, handheld fans, table fans, and clip fans. They use significantly less power than air conditioners and can be sufficient for mild climates. Even a couple of USB fans might get the job done.
Evaporative Coolers: Also known as swamp coolers, these are particularly effective in dry climates. They work by passing air over or through water-saturated pads, causing the water to evaporate and cool the air. Make sure you turn them off before nightfall to get rid of excessive humidity. If you live or are travelling through a very humid area, these coolers might not be the best choice as they’ll increase the relative humidity inside your RV.
Roof Vents: Installing a roof vent can help release hot air that naturally rises to the top of the van. Some roof vents come with built-in fans for improved air circulation. Find out more about roof vents. One of the best models on the market is the Maxxair Maxxfan Deluxe roof vent.
Shade and Insulation: Enhancing your van’s insulation can keep it cooler in summer and warmer in winter. If you haven’t done it yet, read our Complete Guide to Van Insulation. Additionally, using awnings or parking under trees for natural shade can significantly reduce internal temperatures.
Ventilation Strategies: Proper ventilation can greatly reduce heat buildup. This includes parking in the shade, using insulating window covers, T-vent windows and creating cross-ventilation by opening windows on opposite sides of the van. Floor vents help circulate air, too.
Air circulation: @vandercamp_adventures
Each of these alternatives has its advantages and limitations. Your choice will depend on factors such as your typical travel climate, van size, and power availability. By combining several of these options, you can create a comfortable environment in your campervan without the need for an AC air conditioning unit.
Embarking on the journey of installing a DC air conditioning unit in your campervan or RV is both an exciting and technically demanding task. But if you’ve gone through other parts of your van build, it won’t be something out of your reach.
Before we dive into the technicalities of the installation, make sure you’re familiar with some metalwork and have acquired some electrical knowledge.
Before starting, it's crucial to gather all the necessary tools and materials for this particular task. This preparation ensures a smooth and efficient installation process. Here's a basic list of what you'll need:
Bosch Power Drill and Drill Bits: For creating mounting holes.
Screwdrivers: Various sizes for different screws during installation; always useful.
Hammerite Metal Paint: For protecting bare metal from rust.
Metal File: For filing burrs on exposed metal.
Jigsaw: For cutting through metal or wood.
Spanner/Wrench Set: To tighten bolts and nuts.
Selection of Clamps: To secure wooden or metal parts you’re working on.
Gorilla Glue: Excellent wood glue, if you need to build a frame.
Wire Strippers and Crimpers: For handling electrical connections.
Electrical Wiring and Connectors: To connect the air conditioner to your van’s power system.
SikaFlex 522 Sealant and Mastic/Butyl tape: To waterproof any exterior installations. Take a look at our article on camper roof sealing for a more detailed look at sealant application and maintenance.
Tape Measure and Level: For precise placement and alignment.
Safety Gear: Including gloves and safety glasses.
It's also advisable to have the air conditioner's installation manual at hand for specific instructions related to your model. For a more complete list of supplies you might need during the installation process, read our Supplies post.
Before we begin, it's important to note that this guide offers a generic overview. Given the wide array of models and designs available in the market, it's impossible to cover the specific intricacies of each one. But you’ll get a general idea of the process.
Before you begin, make sure you get your van wiring right. Here is a complete wiring guide and a useful PDF to download. If you just need to make this one connection, the quick 12V Air Conditioner wiring diagram below will get the job done.
Let’s look at the generic installation steps for a 12V Air Conditioning unit.
Step 1: Choose the location. Decide where to install the unit, considering factors like space, airflow, and accessibility. Make sure it’s a flat area. Normally, the best spot is in between roof rafters (NOT across them).
Step 2: Prepare the area. Clean the area and make any necessary cuts, levelling or adjustments for the unit to fit. If you install the A/C on the roof, the installation guide for a roof fan might come in handy.
Step 3: Mount the unit. Secure the air conditioner in place using the provided mounting kit and ensure it's level. Unless it’s a portable unit, you will likely need to cut a hole in the van body, either on the roof, the wall or the floor. Below is a quick guide that refers to rooftop mounts but the process can be similar for other locations too.
Step 3.1: Choose the location and measure the hole you’re going to cut. You can use masking tape or a marker to lay out the edges.
Step 3.2: Drill four holes in the corners of your markings to let the jigsaw blade in.
Step 3.3: Make sure to add a few drops of tapping and cutting fluid when using the jigsaw, then proceed to cut.
Step 3.4: File any sharp edges.
Step 3.5: Don’t forget to clean and paint the cut area with Hammerite metal paint to keep rust at bay. Also, check out our post How to Treat Rust on a Van.
Step 3.6: Many models provide you with a gasket and framing strips to stabilise and support the weight. If they don’t, you might need a wooden frame under the hole to screw the air con unit onto. You’re going to need wood glue like Gorilla glue and corner clamps.
Step 3.7: Apply mastic/butyl tape and SikaFlex 522 Sealant to seal the hole. Take a look at our guide on camper roof sealing for a breakdown of different sealants and how to use them.
Step 3.8: Install the unit as advised by the manufacturer – the unit may come with the right set of screws and fixing elements.
Step 4: Connect to power. Refer to the electrical diagram on the installation manual to connect the air conditioner to your van's electrical system and any additional accessories. This typically involves wiring the unit to the battery and ensuring all connections are secure and insulated.
If the A/C unit does not include a fuse, make sure you include one of the right type and rating – Read more. Also, don’t forget to ground your electrical system – in a motorhome, that’s done differently from home.
Step 5: Test the unit. Once everything is connected, test the air conditioner to ensure it's operating correctly.
Keep your own safety in mind during the process as well as potential risks arising from external volumes or moving parts when you’ll be driving.
Giving your DC air conditioner some love and care is a crucial aspect of ensuring its longevity and efficiency, so it won’t let you down during your summer adventures.
Proper maintenance includes basic routine maintenance such as cleaning the air filter, and more complex servicing such as refilling the refrigerant gas.
Ever noticed a 'wet dog' smell coming from your air conditioner? This unwelcome odour is often a sign of a dirty air conditioner filter. In fact, the most crucial and frequent task you'll undertake in AC maintenance is filter cleaning.
Why clean the filter? Its function is to prevent dust, pollen, and other airborne particles from circulating in your van. Over time, these particles accumulate and can clog the filter, leading to reduced airflow and efficiency.
Plus, a dirty filter causes bad smells and might become a breeding ground for harmful bacteria, along with mold and mildew. Microorganisms and spores can then circulate through the air potentially impacting the air quality inside your space.
Here's a simple guide:
Locate and remove the filter: Check your unit's manual to find the filter. It's usually easily accessible from the interior or front part of the unit..
Clean the filter: Rinse the filter gently with warm water. For more stubborn dirt, use a mild detergent. Avoid using harsh chemicals or scrubbing too hard, as this can damage the filter.
Dry and replace the filter: Let the filter dry completely before placing it back in the unit. This prevents mould growth and ensures efficient operation.
Inspect other components: Regularly check other parts of the air conditioner, such as the exterior vents and cooling fins, for any blockages, dust accumulation or damage.
Staying on top of filter cleaning not only improves air quality but also enhances the unit's cooling efficiency, reducing the strain on your van's battery. It's also important to regularly inspect the seal around your air-con unit for degradation.
If your air conditioner starts to lose cooling efficiency, it might be time to refill the refrigerant gas. Over time, the refrigerant, commonly known as cooling gas, may deplete due to normal usage or leaks, leading to reduced cooling efficiency.
Besides a reduced cooling power, other signs of low refrigerant include ice formation on the evaporator coil and longer cooling cycles. But how to refill your AC refrigerant?
Sorry folks, but in most cases, refilling the gas is not a DIY job. It requires specialised knowledge and tools to handle the refrigerant safely and to detect and repair leaks in the system. Incorrect handling of refrigerant can be dangerous and may violate environmental regulations.
Schedule an appointment with a certified HVAC technician who specialises in vehicle air conditioning systems. The technician will check for leaks, repair any found, and refill the refrigerant to the manufacturer-specified level.
Also, consider having your air conditioning system checked annually, especially before the onset of warmer weather. This proactive approach can prevent unexpected breakdowns and maintain the efficiency of your 12V cooling system.
Even with regular maintenance, you might run across issues with your 12V air conditioner. Here is a table with some common problems and basic troubleshooting tips.
Remember, if you're ever in doubt or the problem seems complex, it's best to seek professional help. Regular maintenance and timely troubleshooting can greatly extend the life and efficiency of your air conditioner.
You might be aware that the widespread use of air conditioners in cities during summer leads to soaring energy consumption and strain on power grids. This contributes to urban heat islands and exacerbates environmental issues.
Embracing a campervan lifestyle often goes hand-in-hand with a desire for sustainability and off-grid living. When it comes to cooling solutions, this means finding options that align with eco-friendly principles and independence from constant power sources.
Here are some tips and considerations for sustainable cooling:
Solar Power: One of the most obvious, effective and eco-friendly ways to power your 12V air conditioner is through solar panels. By harnessing solar energy, you can run your air conditioning unit without relying on external power sources. This setup is ideal for long-term travel and off-grid living.
Energy Efficiency: Choosing energy-efficient appliances, including your 12V air conditioner, is crucial for sustainable van life. Look for units with high energy efficiency ratings, as they consume less power and reduce the strain on your solar setup or batteries.
Proper Insulation: Efficient insulation in your van can significantly reduce the need for constant cooling, further conserving energy. Read more about it in our Insulation post.
Eco-Friendly Practices: Apart from technological solutions, adopting eco-friendly practices can enhance the sustainability of your campervan. This includes mindful usage of your air conditioner, maximising natural ventilation, and parking in shaded areas to reduce heat buildup. Installing an awning adds shaded outdoor space and prevents the sun from shining into your van, and is an excellent alternative to air con. Every small step towards reducing energy consumption contributes to a more sustainable and responsible travel lifestyle.
Ultimately, the goal is to balance comfort with environmental consciousness. By choosing the right equipment and adopting sustainable practices, you can enjoy the freedom of van life while minimising your ecological footprint.
This approach not only benefits the environment but also fosters a deeper connection with nature and the places you explore.
As we end our journey through the world of 12V air conditioners for campervans, we can draw some conclusions on the pivotal role these devices play in enhancing our mobile living experience.
These compact, efficient units can transform our campervans into havens of relaxation and serenity, enabling us to explore the world without sacrificing the comforts of home.
Whether you’re in the middle of your van conversion, still in the planning phase or already have your rig set up, remember that your choice of air conditioning is a crucial element of your journey.
Don't forget to subscribe to The Van Conversion Newsletterfor everything you need to get started with your own van conversion (we'll send you a free wiring diagram when you join).
If you're looking for some guidance with your van conversion, you might be interested in our book Roaming Home, or in our online course The Van Conversion Mastery Course. You'll learn directly from our founder Shane how to convert a van into your dream home - no prior experience needed. Shane also offers one-to-one consultations, where he'll help you with any aspect of your build in a face-to-face video call. All consultations come with a free copy of Roaming Home and our Diagram Pack.
Finally, our Van Conversion Ultimate Guide lays out the whole van conversion process in easy-to-follow sections with tools, materials, and step-by-step instructions. It's the perfect companion for your van build.
Are you interested in learning more about Liquid Diesel Heater? Contact us today to secure an expert consultation!