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

About $10.95 a month, assuming 1,100 W at a 80% duty cycle, 8 hours a day, 120 days a year at 15.55¢/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?

South Carolina has the 21st cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $155 a year.

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Cost to run a portable air conditioner in South Carolina (June 2026 rates)

At 15.55¢ per kilowatt-hour — South Carolina's average residential price in June 2026 — running a portable air conditioner costs $131 a year. That is 15% less than the national average of $155. South Carolina's residential rate is up 5.1% from June 2025, which moves this appliance from $125 to $131 a year.

Per hour: 13.7¢
Per day of use: $1.09
Per month: $10.95
Per year: $131

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 South Carolina compares

South Carolina pays 15.55¢/kWh, the 21st cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $23.57 less a year than the typical U.S. household pays for the same use. Running the same portable air conditioner costs $111 a year in Nevada and $445 in Hawaii, so where you live changes this bill by $335 a year.

State	Rate	Per month	Per year
South Dakota	15.36¢	$10.81	$130
West Virginia	15.45¢	$10.88	$131
South Carolina	15.55¢	$10.95	$131
Kansas	15.71¢	$11.06	$133
Iowa	15.93¢	$11.21	$135

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

What else costs about the same in South Carolina

Space heater$134 a year in SC Garage refrigerator$140 a year in SC Electric clothes dryer$121 a year in SC

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 South Carolina?: About $10.95 a month, assuming 1,100 W at a 80% duty cycle, 8 hours a day, 120 days a year at 15.55¢/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?: South Carolina has the 21st cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $155 a year.