How much does a space heater cost per month in Idaho?

About $9.89 a month, assuming 1,500 W at a 60% duty cycle, 8 hours a day, 120 days a year at 13.73¢/kWh.

How many kilowatt-hours does a space heater use?

Roughly 864 kWh a year under these assumptions, or 0.90 kWh for every hour it runs.

Is that expensive compared with other states?

Idaho has the 6th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $158 a year.

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Cost to run a space heater in Idaho (July 2026 rates)

At 13.73¢ per kilowatt-hour — Idaho's average residential price in July 2026 — running a space heater costs $119 a year. That is 25% less than the national average of $158. Idaho's residential rate is up 11.8% from July 2025, which moves this appliance from $106 to $119 a year.

Per hour: 12.4¢
Per day of use: 98.9¢
Per month: $9.89
Per year: $119

Assumption: 1,500 W at a 60% duty cycle, 8 hours a day, 120 days a year — 864 kWh a year. 1,500 W is the ceiling for a 120 V plug-in heater, and nearly every model sold hits it on high. A thermostat changes how often it runs, not how hard. Use the calculator to swap in the numbers from your own model.

How Idaho compares

Idaho pays 13.73¢/kWh, the 6th cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $39.57 less a year than the typical U.S. household pays for the same use. Running the same space heater costs $110 a year in Louisiana and $415 in Hawaii, so where you live changes this bill by $305 a year.

State	Rate	Per month	Per year
North Dakota	13.41¢	$9.66	$116
Tennessee	13.71¢	$9.87	$118
Idaho	13.73¢	$9.89	$119
Nebraska	13.78¢	$9.92	$119
Kentucky	13.81¢	$9.94	$119

States ranked by average residential price, cheapest first. See all 51 states for a space heater.

What else costs about the same in Idaho

Portable air conditioner$116 a year in ID Garage refrigerator$124 a year in ID Electric clothes dryer$107 a year in ID

Cutting the number down

Heating one occupied room and letting the rest of the house sit cooler is the whole case for a space heater. Running one in every room costs more than central heat.
Ceramic, oil-filled and infrared heaters all convert essentially 100% of the electricity to heat. At the same wattage the running cost is identical, whatever the box claims.
The cheapest watt is the one you skip: closing the door to the room you are heating does more than any model upgrade.

Questions

How much does a space heater cost per month in Idaho?: About $9.89 a month, assuming 1,500 W at a 60% duty cycle, 8 hours a day, 120 days a year at 13.73¢/kWh.
How many kilowatt-hours does a space heater use?: Roughly 864 kWh a year under these assumptions, or 0.90 kWh for every hour it runs.
Is that expensive compared with other states?: Idaho has the 6th cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $158 a year.