How many watts does a portable air conditioner use?
A portable air conditioner uses 800–1,420 watts while running, which is 6.7–11.8 amps at 120 V.
Portable air conditioner watts, amps and circuit
| Running watts | 800–1,420 W |
|---|---|
| Voltage | 120 V |
| Running amps | 6.7–11.8 A |
| Circuit | standard 120 V outlet |
Also called: portable ac, portable ac unit.
Portable air conditioner watts by size and type
| Size or type | Running watts, W | Volts, V | Amps, A | Starting watts, W |
|---|---|---|---|---|
| Portable air conditioner | 800–1,420 | 120 | 6.7–11.8 | — |
| 5,000 BTU | 800 | 120 | 6.7 | — |
| 6,000 to 8,000 BTU | 900–1,100 | 120 | 7.5–9.2 | — |
| About 10,000 to 12,000 BTU | 1,350–1,420 | 120 | 11.3–11.8 | — |
What size generator runs a portable air conditioner?
A portable air conditioner needs a generator that supplies at least 1,420 running watts. Starting a portable air conditioner takes a short surge of several times its running watts, and the surge is not listed here: size the generator from the locked-rotor amps (LRA) on the nameplate or the maker's generator guidance, not from the running watts.
How long a portable power station runs a portable air conditioner
| Battery capacity, Wh | At 1,420 W, h | At 800 W, h |
|---|---|---|
| 500 | 0.3 | 0.5 |
| 1,000 | 0.6 | 1.1 |
| 2,000 | 1.2 | 2.1 |
| 3,600 | 2.2 | 3.8 |
A 500 Wh portable power station runs a portable air conditioner drawing 1,420 W for about 0.3 hours at 85% inverter efficiency. Runtime = capacity × 85% ÷ watts; the 85% efficiency is an assumption. The power station's AC output must be at least 1,420 W.
What it costs to run a portable air conditioner
Running a portable air conditioner at 1,110 W, the middle of its 800–1,420 W range, for one hour a day uses 405.2 kWh a year. That costs about $73 a year at $0.18 per kWh, the US average residential price for August 2026.
Your bill's total ÷ kWh used. 0.18 is the US residential average.
- Per day
- $0.20
- Per year
- $73
- Energy per day
- 1.11 kWh
- Energy per month
- 33.8 kWh
How it is calculated
- kWh per day = 1,110 W × 1 h ÷ 1,000 = 1.11
- Per month = 1.11 kWh × 30.4 days × $0.18 = $6.08
What affects portable air conditioner power use
A portable air conditioner sits inside the room and vents heat through a hose, so it uses more watts than a window unit of similar cooling. Sizes are as GE lists them; current US boxes show the DOE SACC rating, older ones a higher ASHRAE number for the same unit. The compressor cycles with the thermostat. Plug it straight into a wall outlet, not an extension cord.
How the amps are calculated
Amps = watts ÷ volts. For 1,420 W at 120 V that is 11.8 A. The 800–1,420 W range covers typical models; the nameplate on a portable air conditioner gives the exact figure.