Camper Air Conditioners: Rooftop, 12 V and Portable, Explained
A real camper air conditioner has a compressor and moves heat outside. Rooftop units fit the standard 14 x 14 in vent opening and run on a 120 V hookup or, as 12 V parking units, on your battery bank. Portable units vent through hoses. Water-based air coolers are not air conditioners.
A camper air conditioner is a compressor unit that pumps heat from the cabin to the outside. It comes in three shapes: rooftop units in the vent opening, 12 V parking units that run from your battery, and portable units that vent through a hose or a window. This page explains each type, the power math and the units we cover.
How does a camper air conditioner work?
A compressor moves heat from an indoor coil to an outdoor coil, and a fan pushes that heat outside. That is why every real AC has an outdoor part: a rooftop shroud, a separate outdoor unit, or a hose to a window.
Cooling is often rated in BTU/h. To convert to watts of cooling, multiply by 0.293: 8,500 BTU/h is about 2,490 W of cooling. The power the unit draws from your hookup or battery is a separate, lower number.
What types of camper AC are there?
There are three: rooftop units, 12 V parking units (rooftop or split) and portable units.
| Type | Power | Strengths | Catch |
|---|---|---|---|
| Rooftop, 120 V | 30 A hookup or generator | Most cooling, standard 14 x 14 in opening | Tall, heavy, needs shore power |
| 12 V parking AC (rooftop or split) | Battery bank, no engine | Cools off-grid, low profile | Needs a big battery; high amps |
| Portable (hose or window saddle) | 120 V outlet | No roof cutting | Takes floor space; less cooling |
Many 12 V rooftop units also heat, some with a heat pump. A heat pump reverses the cycle and is efficient in mild weather.
How much power does a camper AC need?
Plan for the running watts plus a start-up surge of 2 to 3 times that. Available watts = volts × amps. At 120 V, a 30 A hookup supplies 3600 W and a 15 A outlet 1800 W. A 50 A service has two 120 V legs, for 12,000 W.
On battery, amps = watts ÷ volts. A 750 W 12 V unit pulls about 62 A, so a 200 Ah 12 V bank (2,400 Wh) runs it for roughly three hours at full power. Run your own numbers in the RV power calculator.
How do I choose a camper AC in 5 points?
Start from where you camp and how you get power, then check cooling, fit and noise.
- Power source. Hookups point to a 120 V rooftop unit; off-grid points to a 12 V parking unit with a large battery bank.
- Believable cooling. Check that the BTU and the watts of cooling agree (BTU/h × 0.293 = W). Several 12 V listings do not.
- Roof fit. Most listings state the 14 x 14 in opening; check height too if you park in garages.
- Heating. A heat pump adds shoulder-season heat. It does not replace a real heater in winter.
- Noise. Look at the dB figure for bedroom use, and note whether it applies to a sleep mode only.
How do the main units compare?
These six include 120 V and 12 V rooftop units, a 12 V split and two portables. Every figure comes from the Amazon listing; an empty cell means the manufacturer does not publish it.
| Model | Cooling (BTU/h) | Cooling (W) | Power (W) | Voltage (V) | Noise (dB) | Weight (kg) | VanThermia score | Best for | |
|---|---|---|---|---|---|---|---|---|---|
| 8,500 | 2,491 | 750 | 12 | 40 | 24 | 9.5 | Off-grid with heat pump | ||
| 8,500 | 2,491 | 800 | 12 | 45 | 17.5 | 8.5 | Low roof profile | ||
| 11,000 | 3,224 | 1,316 | 120 | 65 | — | 7.5 | 30 A hookups | ||
| 9,000 | 2,638 | 650 | 12 | 35 | 29.9 | 8 | Quiet 12 V split | ||
| 6,800 | 1,993 | 550 | 120 | 45 | 15.9 | 7.5 | No roof cutting | ||
| 6,500 | 1,905 | 650 | 120 | 52 | 21 | 6.5 | Window mount |
(affiliate link) · Data from the Amazon listing; offers may change.
The Dometic Brisk II declares the most cooling, 11,000 BTU/h, but needs 1316 W from a 120 V hookup. The 12 V units cluster around 8,500-9,000 BTU/h at 650-800 W. On the portable side, the FO-KOKO declares 6,800 BTU/h at 550 W and adds a heat mode.
Where should I go next?
Pick the page that matches your plan:
- Rankings: the best RV rooftop air conditioners and the best portable air conditioners for campers.
- Power: the RV power calculator for hookup amps and battery runtime.
- Cheaper cooling first: a roof vent fan moves hot air out at a fraction of the power, and good van insulation keeps the sun’s heat out.
- Airflow and damp: our ventilation and damp hub.
All about camper and rv air conditioners
Rankings and picks
- The 4 Best Portable Air Conditioners for Camper Vans and RVs (2026)The 4 best portable air conditioners for camper vans and RVs, all with real compressors, ranked on cooling per watt, venting, noise and heat mode.
- The 8 Best RV Rooftop Air Conditioners of 2026 (120 V and 12 V)The 8 best RV rooftop and 12 V parking air conditioners of 2026, ranked on cooling, power draw, heat pump and noise, with the battery and hookup math.
Frequently asked questions
Do evaporative air coolers work in a camper van?
Not as air conditioning. They have no compressor: they add moisture to the air and cool only a little, less the more humid the day. A real AC has a compressor and moves the heat outside.
Can I run a rooftop AC on batteries?
A 12 V parking AC is built for it. At 750 W, it draws about 62 A from a 12 V bank, so runtime depends on how many watt-hours you carry. A 120 V rooftop unit on an inverter works too, but inverters lose 10-15 %.
Will a rooftop AC run on a 15 A outlet?
It is tight. A 15 A outlet at 120 V gives 1800 W, and a compressor starts with a surge of 2 to 3 times its running power. A 30 A hookup gives 3600 W and much more headroom.
Does a rooftop AC fit my existing roof vent?
Many do: the listings we cover state the standard 14 x 14 in (35.6 x 35.6 cm) opening. Check the listing for the minimum and maximum opening and your roof thickness before you buy.
What is a heat pump AC?
An air conditioner that can reverse its cycle to heat the cabin as well as cool it. It is efficient in mild weather, but it does not replace a diesel heater on freezing nights.