How much does it cost to run a space heater?
About $41.46 a month on the typical usage below, at the U.S. average $0.1816/kWh. Set your own rate and usage and the figure updates instantly.
Plug-in heaters run at 1,500W on high — there is no low-power mode that still heats a room.
Running a space heater at 1,500W for 5 h a day costs about
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A space heater is one of the most expensive things you can plug into a wall. Electric-resistance heat is 100% efficient at making heat, but that's exactly the problem: every watt becomes heat at full price, so a 1,500-watt heater costs the same to run as fifteen 100-watt bulbs blazing all at once.
Run that heater eight hours a night through a cold month and it quietly becomes the biggest single line on your electric bill — often more than your fridge, TV and computer combined. The trick is never the heater's setting; it's how few hours and how small a space you can get away with.
What drives the cost of running a space heater
- It draws the full 1,500W whenever the element is on — the thermostat just cycles it on and off, it never sips.
- Heating is measured in hours: a heater left on overnight costs roughly 8× one left on for an hour.
- Resistance heat has no efficiency trick — unlike a heat pump, it can't move heat, only make it.
How to cut it
- Heat the one room you're in and shut the door, instead of fighting a cold house.
- Use the built-in thermostat and set it as low as is comfortable — every degree is real money.
- A heated blanket (~100W) keeps a person warm for a fraction of a 1,500W heater warming a room.
- If you heat a room for hours every day, a small heat-pump unit moves 3–4× the heat per watt.
Data basis
- Electricity price
- U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.B, June 2026 year to date, released 2026-08-26. Retrieved 2026-09-11. Average residential revenue per kWh. A benchmark average, not a utility tariff — it excludes the fixed charges, tiers, time-of-use windows, taxes and fuel adjustments on a real bill.
- Appliance energy
- A representative running power for a space heater, compiled from published manufacturer specifications and public appliance-energy guidance, and presented as a typical figure with the usual range shown above. It is not a measurement of your unit, and we do not claim a single primary source for it — the nameplate on your appliance, or an hour with a plug-in energy meter, beats any typical figure we can publish.
- Usage model
- Steady load — 1,500W for 5 h a day
- International prices
- rounded typical household tariffs for each market, in that market's own currency unless the row says US$ equivalent. These are planning benchmarks with no single primary source; enter the per-kWh price from your own bill for an accurate figure.
- Last reviewed
- 20 August 2026. Next scheduled review 20 February 2027.
- Corrections
- Think a figure is wrong? Tell us at corrections@watt-dollar.com and see our corrections policy.
Common questions
How much does it cost to run a space heater per month?
On the assumption shown above — 1,500W for 5 h a day — a space heater costs about $41.46 a month, or $497 a year, at $0.1816/kWh. That price is the U.S. average; set your own rate and usage above and the figure updates.
How is that worked out?
Power drawn while running x hours run per day. At 1,500W for 5 h a day that is 7.50 kWh a day, which at $0.1816/kWh costs $1.36 a day.
How can I cut the cost of running a space heater?
Heat the one room you're in and shut the door, instead of fighting a cold house. As a worked example: running it 4 h a day instead of 5 h takes it from $497 to $398 a year, about $99.43 less.
Do I really pay that every year?
Only if you run it every day. Most people don't: over a typical 120-day heating season the same usage comes to about $163. The annual figure assumes daily use all year.