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

About $33.97 a month, assuming 1,500 W at a 60% duty cycle, 8 hours a day, 120 days a year at 47.18¢/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?

Hawaii has the most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $157 a year.

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Cost to run a space heater in Hawaii (August 2026 rates)

At 47.18¢ per kilowatt-hour — Hawaii's average residential price in August 2026 — running a space heater costs $408 a year. That is 160% more than the national average of $157. Hawaii's residential rate is up 22.5% from August 2025, which moves this appliance from $333 to $408 a year.

Per hour: 42.5¢
Per day of use: $3.40
Per month: $33.97
Per year: $408

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 Hawaii compares

Hawaii pays 47.18¢/kWh, the most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $251 more a year than the typical U.S. household pays for the same use. Running the same space heater costs $110 a year in Nevada and $408 in Hawaii, so where you live changes this bill by $298 a year.

State	Rate	Per month	Per year
Alaska	29.41¢	$21.18	$254
California	29.75¢	$21.42	$257
Massachusetts	30.48¢	$21.95	$263
Maine	32.11¢	$23.12	$277
Hawaii	47.18¢	$33.97	$408

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

What else costs about the same in Hawaii

Portable air conditioner$399 a year in HI Garage refrigerator$425 a year in HI Electric clothes dryer$368 a year in HI

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 Hawaii?: About $33.97 a month, assuming 1,500 W at a 60% duty cycle, 8 hours a day, 120 days a year at 47.18¢/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?: Hawaii has the most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $157 a year.