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

About $30.13 a month, assuming 3,500 W at a 70% duty cycle, 8 hours a day, 120 days a year at 15.37¢/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?

South Dakota has the 18th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $431 a year.

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Cost to run a central air conditioner in South Dakota (July 2026 rates)

At 15.37¢ per kilowatt-hour — South Dakota's average residential price in July 2026 — running a central air conditioner costs $362 a year. That is 16% less than the national average of $431. South Dakota's residential rate is up 5.9% from July 2025, which moves this appliance from $342 to $362 a year.

Per hour: 37.7¢
Per day of use: $3.01
Per month: $30.13
Per year: $362

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 South Dakota compares

South Dakota pays 15.37¢/kWh, the 18th cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $69.15 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 Louisiana and $1,129 in Hawaii, so where you live changes this bill by $830 a year.

State	Rate	Per month	Per year
North Carolina	15.16¢	$29.71	$357
Kansas	15.27¢	$29.93	$359
South Dakota	15.37¢	$30.13	$362
Arizona	15.38¢	$30.14	$362
South Carolina	15.47¢	$30.32	$364

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

What else costs about the same in South Dakota

Hot tub$384 a year in SD Heat pump$332 a year in SD Pool pump$266 a year in SD

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 South Dakota?: About $30.13 a month, assuming 3,500 W at a 70% duty cycle, 8 hours a day, 120 days a year at 15.37¢/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?: South Dakota has the 18th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $431 a year.