How much does a window air conditioner cost per month in North Dakota?

About $7.72 a month, assuming 900 W at a 80% duty cycle, 8 hours a day, 120 days a year at 13.41¢/kWh.

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

Roughly 691 kWh a year under these assumptions, or 0.72 kWh for every hour it runs.

Is that expensive compared with other states?

North Dakota has the 4th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $127 a year.

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Cost to run a window air conditioner in North Dakota (July 2026 rates)

At 13.41¢ per kilowatt-hour — North Dakota's average residential price in July 2026 — running a window air conditioner costs $92.69 a year. That is 27% less than the national average of $127. North Dakota's residential rate is up 0.8% from July 2025, which moves this appliance from $92.00 to $92.69 a year.

Per hour: 9.7¢
Per day of use: 77.2¢
Per month: $7.72
Per year: $92.69

Assumption: 900 W at a 80% duty cycle, 8 hours a day, 120 days a year — 691 kWh a year. Typical of a 10,000 BTU window unit. Small 5,000 BTU units draw closer to 500 W; 15,000 BTU units closer to 1,400 W. Use the calculator to swap in the numbers from your own model.

How North Dakota compares

North Dakota pays 13.41¢/kWh, the 4th cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $33.87 less a year than the typical U.S. household pays for the same use. Running the same window air conditioner costs $87.92 a year in Louisiana and $332 in Hawaii, so where you live changes this bill by $244 a year.

State	Rate	Per month	Per year
Nevada	12.77¢	$7.36	$88.27
Utah	13.12¢	$7.56	$90.69
North Dakota	13.41¢	$7.72	$92.69
Tennessee	13.71¢	$7.90	$94.76
Idaho	13.73¢	$7.91	$94.90

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

What else costs about the same in North Dakota

Electric clothes dryer$105 a year in ND Aquarium$79.29 a year in ND Gaming pc$78.31 a year in ND

Cutting the number down

Sealing the gaps around the sleeve with foam matters more than the unit's efficiency rating. Warm air leaking back in is load you pay to remove twice.
An inverter model modulates instead of slamming on and off, which shows up as a lower effective duty cycle rather than a lower nameplate watt.
Shading the outdoor half of the unit lowers the temperature it rejects heat into, which lowers the work it has to do.

Questions

How much does a window air conditioner cost per month in North Dakota?: About $7.72 a month, assuming 900 W at a 80% duty cycle, 8 hours a day, 120 days a year at 13.41¢/kWh.
How many kilowatt-hours does a window air conditioner use?: Roughly 691 kWh a year under these assumptions, or 0.72 kWh for every hour it runs.
Is that expensive compared with other states?: North Dakota has the 4th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $127 a year.