Cost to run

How much does it cost to run a space heater?

A space heater's cost depends mainly on rated watts, how many hours it runs, and how often its thermostat cycles the heating element. Use the preset calculator below with your ZIP code for a state-average estimate.

Reviewed 2026-06-21 · methodology appliance-energy-1.0.0 · data vintage 2026-03-ytd

Example costs using the Texas state-average rate

These are generated examples for a consistent location. Enter your own ZIP and usage below for a more relevant state-average estimate.

Scenario	Assumption	kWh/month	Monthly range	Most likely/year
Occasional use	2 hours a day on 10 days in a month	18.00	$1.88–$4.20	$103.81
Regular use	6 hours a day on 20 days in a month	144.00	$15.07–$33.64	$415.22
Heavy use	8 hours a day on 30 days in a month	324.00	$33.91–$75.68	$622.84

Source: U.S. Energy Information Administration, Electric Power Monthly Table 5.6.B. Data vintage 2026-03-ytd. State-average pricing is not your exact utility tariff.

Calculate your own usage

Your inputs

Your estimate — a range, confidence level, and the sources behind it — will appear here.

What changes a space heater's running cost?

Rated wattage sets the maximum electrical draw. Runtime and thermostat cycling determine how long the heating element is actually energized. Room size, insulation, outdoor temperature, and thermostat setting can all change that duty cycle.

How to get a better estimate

Check the heater's nameplate or manual for rated watts, then estimate actual hours used. If the heater switches on and off after the room warms, lower the duty-cycle input instead of treating every plugged-in hour as full-power operation.

Important limitations

This model estimates the heater's incremental electricity use. It does not compare the heater with a central heating system, model room heat loss, or assess whether an outlet, extension setup, or heater placement is safe. Follow the manufacturer's safety instructions.

Frequently asked questions

Does a 1,500-watt heater always draw 1,500 watts?

It may draw close to its rated power while the heating element is on, but thermostat cycling can reduce average use over a longer period. That is why the calculator includes a duty-cycle input.

Why does my actual bill differ from the estimate?

Your utility tariff, taxes, fees, weather, room heat loss, and actual thermostat cycling can differ from the state-average assumptions used here.

Can this compare a space heater with a heat pump?

Not reliably. Heat pumps require a different model that accounts for efficiency, heating mode, climate, and building load.

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