Space Heater Cost to Run in 2026: What a 1,500 W Heater Costs per Hour, per Day and per Month in Every State

The formula (and why the label wattage is all you need)

Electric resistance heaters have no moving efficiency: a 1,500 W element delivers 1,500 W of heat, which is 5,118 Btu per hour (1 kWh = 3,412 Btu, per EIA's conversion factors). Ceramic, oil-filled, infrared and fan-forced models all obey the same rule; they differ in how they distribute heat, not in how much heat they make per watt. So the cost is simply:

cost per hour = watts ÷ 1,000 × rate (¢/kWh) ÷ 100

For 1,500 W at the U.S. average of 18.34¢/kWh: 1.5 × 18.34 ÷ 100 = $0.28 per hour. Plug your own rate and hours into the electricity cost calculator, or look up your utility's exact energy charge with the bill-reading guide. The rate that matters is the marginal one: if you are on a tiered plan and the heater pushes you into a higher tier, use the higher tier's price.

1,500 W space heater cost by state (June 2026 EIA rates)

All 50 states plus DC, ranked from cheapest to most expensive electricity. "8 h/day" is 240 hours a month (360 kWh); "24/7" is 720 hours (1,080 kWh). The U.S. average row is highlighted.

The spread is the whole story: the same heater running the same hours costs 4.0× more in Hawaii than in Nevada. If you are in the top ten, see the average electric bill by state breakdown for what 360 extra kWh does to a whole bill.

Space heater vs furnace vs heat pump: cost for the same heat

The fair comparison is cost per unit of heat, not cost per appliance. A 1,500 W heater delivers 5,118 Btu/h. To deliver the same heat, a 95% AFUE gas furnace burns 5387 Btu of gas, which at EIA's 1,036 Btu per cubic foot is 5.20 cubic feet, costing $0.08 at the 2025 U.S. average residential gas price of $15.34 per thousand cubic feet. A heat pump moving heat at a seasonal COP of 2.5 (a planning assumption for a modern air-source unit in a mild-to-mixed climate) uses 1 ÷ 2.5 of the electricity, so the same heat costs $0.11.

Why space heaters still make sense: they heat 150 square feet instead of 2,000. If a heater in the room you occupy lets you set the central thermostat 5 to 8 °F lower for the evening, the whole-house saving can exceed the heater's cost. Where it fails is the reverse pattern: heater on, thermostat unchanged, which simply adds 360 kWh a month. For a whole-home electricity-vs-gas comparison in your state, see heat pump vs gas furnace running cost by state.

Five ways to cut the number without freezing

1. Use the thermostat, not the switch. A heater with a working thermostat cycles off at set point. In a well-sealed room it may run 40 to 60% of the time, which is the difference between 360 and 180 kWh a month at 8 hours of use.
2. Close the room. Doors shut, curtains closed at night. The heater's output is fixed; what you control is how fast the room loses it. The weatherization guide covers the cheap fixes (door sweeps, window film) that shrink run time.
3. Heat the person before the room. A heated blanket or mattress pad draws 50 to 200 W, one-tenth of a space heater, and covers the eight hours you are asleep.
4. Turn the central system down when the heater is on. This is the only configuration in which a space heater saves money overall.
5. Check for time-of-use pricing. If your utility offers an off-peak rate, evening heater hours often fall in the peak window. The TOU rates guide explains how to read your plan.

Circuit math you should not skip

A 1,500 W heater on a 120 V circuit draws 12.5 A. A standard 15 A household circuit is rated for 12 A of continuous load (80% of breaker rating), so one heater is already close to the limit and a second heater or a hair dryer on the same circuit will trip the breaker, or worse, heat the wiring if the breaker is faulty. Never run a space heater through a power strip or a light-duty extension cord; plug it directly into the wall. If you need to heat more than one room this way, the electricity cost alone is a signal to look at a heat pump or ductless mini-split instead.

Frequently Asked Questions