How much does a portable air conditioner cost per month in California?

About $20.94 a month, assuming 1,100 W at a 80% duty cycle, 8 hours a day, 120 days a year at 29.75¢/kWh.

How many kilowatt-hours does a portable air conditioner use?

Roughly 845 kWh a year under these assumptions, or 0.88 kWh for every hour it runs.

Is that expensive compared with other states?

California has the 4th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $153 a year.

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Cost to run a portable air conditioner in California (August 2026 rates)

At 29.75¢ per kilowatt-hour — California's average residential price in August 2026 — running a portable air conditioner costs $251 a year. That is 64% more than the national average of $153. California's residential rate is down 3.8% from August 2025, which moves this appliance from $261 to $251 a year.

Per hour: 26.2¢
Per day of use: $2.09
Per month: $20.94
Per year: $251

Assumption: 1,100 W at a 80% duty cycle, 8 hours a day, 120 days a year — 845 kWh a year. Single-hose portables push conditioned air out of the room and pull unconditioned air in through every crack to replace it, so real-world runtime is longer than the spec sheet implies. Use the calculator to swap in the numbers from your own model.

How California compares

California pays 29.75¢/kWh, the 4th most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $97.91 more a year than the typical U.S. household pays for the same use. Running the same portable air conditioner costs $107 a year in Nevada and $399 in Hawaii, so where you live changes this bill by $291 a year.

State	Rate	Per month	Per year
New York	28.65¢	$20.17	$242
Alaska	29.41¢	$20.70	$248
California	29.75¢	$20.94	$251
Massachusetts	30.48¢	$21.46	$257
Maine	32.11¢	$22.61	$271

States ranked by average residential price, cheapest first. See all 51 states for a portable air conditioner.

What else costs about the same in California

Space heater$257 a year in CA Garage refrigerator$268 a year in CA Electric clothes dryer$232 a year in CA

Cutting the number down

A dual-hose model draws outdoor air for condenser cooling instead of depressurizing your room. It is the biggest efficiency difference in this category.
Insulating the exhaust hose keeps rejected heat from radiating straight back into the room you just cooled.
For the same BTU rating, a window unit almost always costs less to run than a portable.

Questions

How much does a portable air conditioner cost per month in California?: About $20.94 a month, assuming 1,100 W at a 80% duty cycle, 8 hours a day, 120 days a year at 29.75¢/kWh.
How many kilowatt-hours does a portable air conditioner use?: Roughly 845 kWh a year under these assumptions, or 0.88 kWh for every hour it runs.
Is that expensive compared with other states?: California has the 4th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $153 a year.