How much does a central air conditioner cost per month in Idaho?

About $26.21 a month, assuming 3,500 W at a 70% duty cycle, 8 hours a day, 120 days a year at 13.37¢/kWh.

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

Roughly 2,352 kWh a year under these assumptions, or 2.45 kWh for every hour it runs.

Is that expensive compared with other states?

Idaho has the 5th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $427 a year.

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Cost to run a central air conditioner in Idaho (August 2026 rates)

At 13.37¢ per kilowatt-hour — Idaho's average residential price in August 2026 — running a central air conditioner costs $314 a year. That is 26% less than the national average of $427. Idaho's residential rate is up 10.7% from August 2025, which moves this appliance from $284 to $314 a year.

Per hour: 32.8¢
Per day of use: $2.62
Per month: $26.21
Per year: $314

Assumption: 3,500 W at a 70% duty cycle, 8 hours a day, 120 days a year — 2,352 kWh a year. A 3-ton central system draws roughly 3,500 W with the air handler running. Older or oversized units cycle harder and land higher. Use the calculator to swap in the numbers from your own model.

How Idaho compares

Idaho pays 13.37¢/kWh, the 5th cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $113 less a year than the typical U.S. household pays for the same use. Running the same central air conditioner costs $299 a year in Nevada and $1,110 in Hawaii, so where you live changes this bill by $810 a year.

State	Rate	Per month	Per year
North Dakota	13.31¢	$26.09	$313
Utah	13.31¢	$26.09	$313
Idaho	13.37¢	$26.21	$314
Tennessee	13.42¢	$26.30	$316
Nebraska	13.54¢	$26.54	$318

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

What else costs about the same in Idaho

Hot tub$334 a year in ID Heat pump$289 a year in ID Pool pump$231 a year in ID

Cutting the number down

Each degree you raise the thermostat in summer trims roughly 3% off cooling energy. Two degrees is a rounding error in comfort and a visible line on the bill.
A clogged filter makes the blower work against restriction for an entire season. Replacing it is the cheapest maintenance in the house.
Cooling load tracks the indoor/outdoor gap, so the same thermostat setting costs far more in a 100 F week than an 85 F one.

Questions

How much does a central air conditioner cost per month in Idaho?: About $26.21 a month, assuming 3,500 W at a 70% duty cycle, 8 hours a day, 120 days a year at 13.37¢/kWh.
How many kilowatt-hours does a central air conditioner use?: Roughly 2,352 kWh a year under these assumptions, or 2.45 kWh for every hour it runs.
Is that expensive compared with other states?: Idaho has the 5th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $427 a year.