A typical 10,000 BTU portable air conditioner uses about 1,125 watts while cooling, and roughly 800-1,400 W across common sizes. The compressor needs around 1,800 watts for a moment to start.
- Running watts
- 1,125 WTypical; 800–1,400 W across models
- Starting watts
- 1,800 WCompressor start surge lasting under a second; inverter models surge…
- Per day
- 5.4 kWh8 h of use, cycling
- Current
- 9.4 AAt 120 V while running
Figures checked against DOE, ENERGY STAR and manufacturer data on . Your model's label is the final word.
Watts by model and setting
Most portable air conditioner models draw between 800 and 1,400 W while running; a typical one draws about 1,125 W. Assumes a 10,000 BTU (ASHRAE) unit at 1,125 W for 8 hours with the compressor running about 60% of the time.
- Rated BTU: watts climb with size, e.g., about 1,125 W for 10,000 BTU and 1,350 W for 12,000 BTU (ASHRAE ratings)
- Portable units are less efficient than window units (EER near 9 vs 11-12), so they use more watts for the same cooling
- Single-hose designs pull in warm outside air and run longer than dual-hose designs
- Inverter compressors, room size and outdoor heat
Running a portable air conditioner on a generator or power station
- Generator: at least 1,125 running watts and 2,925 starting watts (running plus the 1,800 W start surge, the cautious way to size it). Check both numbers on the spec sheet. A generator rated 3,000 W or more covers it with room to spare.
- Power station: continuous output of at least 1,125 W and a surge rating that covers about 1,800 W. Pure sine wave output is the safe choice for motors and electronics.
| Power station capacity | Estimated runtime |
|---|---|
| 500 Wh | 0.6 h |
| 1,000 Wh | 1.3 h |
| 2,000 Wh | 2.5 h |
| 3,000 Wh | 3.8 h |
Based on 675 W average draw (running watts × duty cycle) and 85% usable capacity.
- A 2,500-3,000 W generator is a comfortable match for a 10,000-12,000 BTU portable AC plus a few small loads
- Portable power stations need a pure sine wave inverter rated well above 1,125 W continuous and ~1,800 W surge; runtime will be only an hour or two per kWh
- Plug the AC directly into the generator with a heavy-gauge cord; avoid power strips
- Keep the generator outdoors, away from the window where the exhaust hose vents, to avoid carbon monoxide entering the room
Add it to the generator calculator
Questions people ask
Do portable air conditioners use more electricity than window units?
Usually yes. A 10,000 BTU portable can draw about 1,125 W while an 8,000 BTU window unit draws about 660 W, partly because portables lose heat through the hose and cabinet.
What does SACC mean on a portable AC?
SACC (seasonally adjusted cooling capacity) is the DOE rating, which is lower than the older ASHRAE BTU number on the box; compare models using the same rating.