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

About $14.32 a month, assuming 1,500 W at a 60% duty cycle, 8 hours a day, 120 days a year at 19.89¢/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?

Illinois has the 16th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $158 a year.

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Cost to run a space heater in Illinois (June 2026 rates)

At 19.89¢ per kilowatt-hour — Illinois's average residential price in June 2026 — running a space heater costs $172 a year. That is 8% more than the national average of $158. Illinois's residential rate is up 8.7% from June 2025, which moves this appliance from $158 to $172 a year.

Per hour: 17.9¢
Per day of use: $1.43
Per month: $14.32
Per year: $172

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 Illinois compares

Illinois pays 19.89¢/kWh, the 16th most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $13.39 more a year than the typical U.S. household pays for the same use. Running the same space heater costs $113 a year in Nevada and $456 in Hawaii, so where you live changes this bill by $342 a year.

State	Rate	Per month	Per year
Delaware	19.29¢	$13.89	$167
Wisconsin	19.56¢	$14.08	$169
Illinois	19.89¢	$14.32	$172
Pennsylvania	21.73¢	$15.65	$188
Maryland	21.84¢	$15.72	$189

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

What else costs about the same in Illinois

Portable air conditioner$168 a year in IL Garage refrigerator$179 a year in IL Electric clothes dryer$155 a year in IL

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 Illinois?: About $14.32 a month, assuming 1,500 W at a 60% duty cycle, 8 hours a day, 120 days a year at 19.89¢/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?: Illinois has the 16th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $158 a year.