Caroline enjoying a breeze in front of a fan in the camper van, camper van air conditioning guide

Campervan air conditioning: which AC to choose

Electric Autonomy Xavier 8 min
The real question when it comes to campervans is not “what is the most powerful air conditioning,” but “which air conditioning can I actually power and transport.” We sort through roof air conditioning, built-in air conditioning, and battery-powered portable air conditioning, without beating around the bush.

We’ve spent quite a few summers in our campervan, and for a long time, our “air conditioning” consisted of two USB fans and the common sense to head north when it got really hot. It works, but let’s be honest, there are days when we would have liked to just press a button and get some cool air. So here’s the guide we wish we had read beforehand: the three families of air conditioning for campervans, what they are really worth, and which one to choose based on your travel style.

Can you really air condition a campervan?

Let’s start with the uncomfortable truth, because no one tells you this before you buy: a campervan in full sun is like a tin can. It heats up faster than any machine can cool it down. No air conditioning, even fixed, can turn a van parked in the blazing sun into a cold room.

What works, however, is creating a bubble of cool air in a localized area: you cool down the space where you live or sleep, start early in the morning before it heats up, and find shade whenever possible. Marketing promises like “8 degrees cooler in fifteen minutes” are lab measurements in a very small volume. In a real campervan of 15 to 20 m3, expect to gain a few degrees over an hour, much better in the shade than in the sun. Keep this in mind to avoid disappointment.

The cool air bubble, in reality

Temperature inside the camper van during a hot afternoon, without air conditioning and then with a portable air conditioner directed at the living area. Indicative values, drawn from creator feedback.

Curve comparing the indoor temperature without air conditioning, which rises to about 45 degrees around 5 PM, and with a portable air conditioner, which peaks around 40 degrees in the cool air bubble. 45° 40° 35° 30° about 5° gained 2 PM 4 PM 6 PM 8 PM
  • Outside, about 37°
  • Van without air conditioning
  • Van with portable air conditioner

For reference, in full sun. A portable air conditioner does not turn the cell into a cold room; it creates a cool air bubble around you and gains a few degrees, much more in the shade or when starting early in the morning.

The three families of air conditioning for campervans

There are three main solutions, and they don’t play in the same league or at the same price.

Roof air conditioning (12V or 230V)

This is the fixed air conditioning mounted on the roof, a Dometic or a Truma roof unit. Its main advantage is that it cools the entire vehicle fairly evenly, through one or more vents, without cluttering the inside since it lives on the roof. The classic campervan air conditioning, basically.

The downside is twofold. First, the weight: 25 to 30 kg on top affects handling and dimensions, plus you need to cut a hole in the roof and budget between £1,800 and £2,500 installed. Then there’s the electricity, and that’s where it gets expensive: a roof air conditioning unit easily consumes 400 to 1,000 watts. On battery alone, you’ll last one to two hours on a 100 Ah battery, barely more on 200 Ah of lithium. To run it all night autonomously, you need a very large battery bank, a robust inverter, and properly sized solar panels, in short, a real electrical installation.

So the actual use becomes clear: at a site with 230V, it runs all night without a second thought. When off-grid, the right reflex is to turn it on in the evening upon arrival, to dispel the heat accumulated in the cabin all day and lower the temperature before sleeping. And let’s be honest, on some hot nights, even one night isn’t enough.

Built-in 230V air conditioning (like Truma, Dometic)

Installed under a bench or in a storage compartment, it distributes cold air through ducts throughout the cabin. It’s the most comfortable and discreet, almost like home, and often the quietest of the bunch.

But it’s also the most expensive (£2,000 to £2,300 plus installation) and by far the most power-hungry: it requires strong 230V, so a permanent connection or a large battery bank with an inverter. Without mains power, you can’t really use it. It’s the air conditioning for those who stay put at a site with electricity, much less for the nomad who moves around and lives off their batteries.

Battery-powered portable air conditioning

This is the new generation: a standalone unit, placed on the ground, that blows cold air through one vent and expels hot air through a duct to the window. It runs on its own battery, recharges via solar or while driving, installs in a minute without drilling, and most importantly, you can take it out of the van to use at home.

It only cools a bubble around you, not the entire cabin, but in return, it remains much more economical to use: around 100 watts in night mode, enough to last several hours on its own battery without draining the van’s entire battery bank. It’s the solution we prefer for vanlife, and we’ll explain why just after.

Criteria Roof air conditioning Built-in 230V Battery-powered portable
Cooled area The entire vehicle The entire vehicle A localized bubble
Installation Roof cutout Fixed installation + 230V None, in 60 seconds
Off-grid autonomy Limited Low without a large battery bank Battery + solar
Required electricity Large installation or 230V Mandatory 230V mains Its battery + solar
Weight 25 to 30 kg on top Heavy, fixed 10 to 15 kg, portable
Indicative budget £1,800 to £2,500 £2,000 and up £900 to £1,600
Home use possible No No Yes

What each air conditioner consumes

Electric power required in operation, depending on the type of air conditioner. Indicative orders of magnitude: the higher the bar, the more electricity is needed behind it.

1000 to 2000 W
Built-in 230V
400 to 1000 W
Rooftop
300 to 500 W
Portable, cooling
about 150 W
Portable, night mode

For reference, peak power in operation. To compare, a small USB fan draws about ten watts: that's why it runs all night without draining the battery, whereas a rooftop air conditioner can empty a park in one to two hours.

Our choice for vanlife: battery-powered portable air conditioning

For those who drive and seek autonomy, battery-powered portable air conditioning checks the most boxes. No drilling, no installation, a reasonable weight, solar recharging, and this detail that changes everything: it’s the same device as at home. You cool your office or your non-air-conditioned garden shed during the week, and you take it into the cabin on weekends. One investment, two lives.

In this niche, two models stand out: the Zero Breeze Mark 3, the lightest and most compact, and the EcoFlow Wave 3, more powerful and integrated into the EcoFlow ecosystem. We compared them in detail in our comparison of Zero Breeze Mark 3 vs EcoFlow Wave 3, and you can find all the models in our section on portable air conditioners.

Zero Breeze Mark 3 installed in a Mercedes Sprinter van, ducts and cold air outlet in the cabin

Consumption and autonomy: what battery for air conditioning?

This is THE crux of the nomadic lifestyle. A portable air conditioner draws between 300 and 700 W depending on the mode and power. On a dedicated battery of about 1 kWh, this roughly translates to two to three hours at full power, and much more in energy-saving night mode. In other words, a single battery may not last the entire night during a heatwave.

The workaround is to stack batteries (the Mark 3 does this very well) or connect the air conditioning to a large station like the EcoFlow Delta (the strong point of the Wave 3), all recharged by solar during the day. And here comes a tricky dilemma we know well: parking in the shade cools the cabin but cuts off the solar panel recharge. True autonomy is a mix of battery, solar, and a bit of discipline.

July 2026

How long does a battery last?

Approximate autonomy of a portable air conditioner on a single battery of about 1 kWh, depending on the mode. Magnitudes observed on current models.

Night mode, quiet 5 to 8 h
Moderate cold, in the shade 3 to 5 h
Full power, full sun 2 to 3 h

A single battery does not last the night at full power during a heatwave. To last, we stack batteries or plug the air conditioner into a large power station, all recharged by solar during the day.

Cooling while driving, on 12V

Many are looking for a “cooling while driving” solution. The idea is good: with the engine running, the alternator provides almost free power. Some portable coolers, like the Wave 3, run on 12V from the vehicle and draw almost nothing when the engine is running, so they can operate continuously on the road. Handy for arriving at your destination with a cabin already cool.

When stopped, however, you rely on the battery and solar power. The 12V while driving is a nice bonus, not a standalone autonomy solution.

EcoFlow Wave 3 for campervans and vans, portable air conditioner

Heating: most are reversible

We often forget, but a good portable cooler also heats. The Mark 3 and the Wave 3 are reversible units: they blow warm air in mid-season, as long as the ambient temperature stays above zero to ten degrees depending on the model. For a van used in the shoulder seasons, this is a real plus, one device for summer and for cool autumn mornings.

Be careful though: these are not heaters for extreme cold. Below zero, a gas or diesel heater remains essential. The reversible cooler helps out, but it does not replace winter heating.

Installing a portable cooler without drilling

This is the other big advantage of portable units: installation. You place the device, run the hot air exhaust hose through a slightly open window or a roof vent, and you’re good to go in a minute. Manufacturers offer ventilation kits for common van windows (Sprinter, ProMaster, Transit) or a universal cutout.

The only point to take care of, and we learned this the hard way with our old EcoFlow Wave 2, is the sealing of the exhaust: if hot air enters through the same opening as the hose, the cooler cools one side while heating the other. A good seal around the hose, and the efficiency makes a leap.

And what if we could cool down without a cooler?

A cooler is great, but it doesn’t replace good habits. Even before turning anything on, shade, ventilation, and vehicle orientation do half the work. We detailed everything in our guide to avoiding heat in vanlife and our article on ventilation in vans and campervans. Often, the best cooler is simply choosing where to park wisely.

And if you want to dive deeper into a specific point, we’ve gathered our cooler articles right here, from detailed comparisons to tips for staying cooler without turning anything on:

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Campervan air conditioning: frequently asked questions

How many BTU do you need to cool a van?
For a portable AC that cools a bubble of air (a bunk, a living corner), 5,000 to 6,500 BTU is enough in a 9 to 14 sq m van. To cool the whole volume of a big coachbuilt in the sun you would need far more, which is why it pays to partition and target a zone rather than the entire living space.
Can you run an AC off a generator?
Yes, a 1,500 to 2,000 W generator will power a portable AC, but it is noisy, polluting and banned on many campsites and aires. A battery AC with solar charging is quieter and far better suited to real nomad life.
Is a campervan AC too noisy to sleep with?
Recent portable models drop to around 45 to 50 dB in night mode, an acceptable hum. That is much quieter than older generations and than most rooftop units.
Do you have to empty the condensation water?
Recent portable ACs handle condensation with active drainage (a pump or evacuation through the hose), so there is little or no tray to empty. In heavy, very humid use a check is still worth it.
Can you build a DIY solar air conditioner?
Cool-box-and-fan builds freshen the air a little locally but do not replace a real AC: they do not exhaust the heat or dry the air. For regular use a reversible portable AC is far more effective.
What budget should you plan to cool a campervan?
Reckon around 750 to 1,400 pounds for a complete battery portable AC, against 2,000 pounds and up for a fixed rooftop or built-in unit, fitting included. The portable one has the edge of doubling as home cooling.
Can a portable AC also be used at home?
Yes, that is its big strength: the same unit cools a room at home with no AC (an office, a garden shed, a loft bedroom) then rides along in the campervan when you set off. One investment, two uses.

PS: we traveled for a long time without any cooling at all, just by fleeing the heat north in the summer. If you can organize your summers like that, save your money. Otherwise, a good battery-powered portable unit is the best compromise we know.