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.
Content reviewed 2026-09-27 · Rates published 2026-09-24 · methodology appliance-energy-1.0.0 · data vintage 2026-07-ytd
Using the regular use assumptions below, electricity costs about $1.16 per day of use and $23.13 for 20 days of use at the Texas average rate. Adjust the calculator for your equipment and schedule.
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 | Cost/day of use | Monthly range | Cost at 365 days/year |
|---|---|---|---|---|---|
| Occasional use | 2 hours a day on 10 days in a month 1500 W × 2 h/day × 0.6 duty × 10 days × 1 unit(s) | 18.00 | $0.29 | $1.91–$4.27 | $105.51 |
| Regular use | 6 hours a day on 20 days in a month 1500 W × 6 h/day × 0.8 duty × 20 days × 1 unit(s) | 144.00 | $1.16 | $15.32–$34.19 | $422.06 |
| Heavy use | 8 hours a day on 30 days in a month 1500 W × 8 h/day × 0.9 duty × 30 days × 1 unit(s) | 324.00 | $1.73 | $34.47–$76.93 | $633.09 |
Wattage, runtime and duty cycle below are illustrative assumptions, not measurements of a particular model. Annual figures assume use on all 365 days; monthly figures use each scenario's stated number of days.
Source: U.S. Energy Information Administration, Electric Power Monthly Table 5.6.B. Data vintage 2026-07-ytd. State-average pricing is not your exact utility tariff.
What does one use cost?
These examples use the full 1,500 W input continuously. Actual thermostat cycling can reduce energy use. Electricity cost is not an assessment of outlet capacity or safe placement; follow the manufacturer's instructions.
| Task | Assumptions | kWh/use | Estimated cost/use |
|---|---|---|---|
| 1 hour | 1,500 W × 1 h, continuous | 1.5000 | $0.24 Range $0.16–$0.36 |
| 4 hours | 1,500 W × 4 h, continuous | 6.0000 | $0.96 Range $0.64–$1.42 |
| 8 hours | 1,500 W × 8 h, continuous | 12.0000 | $1.93 Range $1.28–$2.85 |
Illustrative usage, priced at the same Texas state average as the calculator. Costs are rounded to cents; actual consumption and your utility price can differ.
Calculate your own usage
Your inputs
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?
Why does my actual bill differ from the estimate?
Can this compare a space heater with a heat pump?
Compare options and check your assumptions
Related appliance cost guides
- Electric Baseboard Heater Cost to Run
- Electric Fireplace Cost to Run per Month
- Heat Pump Cooling Cost per Month, Estimated
Compare all published appliances · Electricity rates in your state · Read the methodology · Review the data sources · How we check these guides