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

About $21.46 a month, assuming 1,100 W at a 80% duty cycle, 8 hours a day, 120 days a year at 30.48¢/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?

Massachusetts has the 3rd 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 Massachusetts (August 2026 rates)

At 30.48¢ per kilowatt-hour — Massachusetts's average residential price in August 2026 — running a portable air conditioner costs $257 a year. That is 68% more than the national average of $153.

Per hour: 26.8¢
Per day of use: $2.15
Per month: $21.46
Per year: $257

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 Massachusetts compares

Massachusetts pays 30.48¢/kWh, the 3rd most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $104 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
Alaska	29.41¢	$20.70	$248
California	29.75¢	$20.94	$251
Massachusetts	30.48¢	$21.46	$257
Maine	32.11¢	$22.61	$271
Hawaii	47.18¢	$33.21	$399

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

What else costs about the same in Massachusetts

Space heater$263 a year in MA Garage refrigerator$274 a year in MA Electric clothes dryer$238 a year in MA

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 Massachusetts?: About $21.46 a month, assuming 1,100 W at a 80% duty cycle, 8 hours a day, 120 days a year at 30.48¢/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?: Massachusetts has the 3rd most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $153 a year.