Heating & Cooling · South
Cost to run a space heater in Texas
At Texas’s average residential rate of 15.91¢ per kWh, a space heater drawing 1500W for 8 hours a day, at a 100% duty cycle, costs about $58.12 per 30.44 use days. Change the numbers below to match how you actually use yours.
For seasonal use in Texas, enter the days you actually run this space heater in the calculator. The reference tables assume 365 use days; they are not a forecast of local weather, your thermostat settings or your annual bill.
Space Heater electricity cost calculator
Use watts and running time, or enter energy from a label, meter or completed load. Your inputs stay on this device.
Enter a number within each field’s limits to calculate your cost.
Your estimated energy cost
4,380 kWh across 365 use days per year
Power mode includes your selected duty cycle. The monthly figure assumes 30.44 use days; the annual total uses your selected use days. These are estimates at the entered rate.
Energy charges only. Fixed utility fees, purchase, installation and maintenance are excluded. See the calculation method and sources.
Why the cost differs in Texas
Texas has the 22nd cheapest residential electricity of the 50 US states and Washington, DC we track, at 15.91¢ per kWh against a national average of 18.16¢. That is -12.4% compared with the national figure. Texas runs its own grid, ERCOT, largely isolated from the national interconnections, and most households buy from competing retail providers. That matters more here than anywhere: plans vary enormously in structure, including fixed, variable, free-nights and tiered pricing, so your contracted rate may differ sharply from the state average. Summer cooling dominates, and extreme heat events drive both demand and wholesale prices.
For this appliance specifically, the difference works out to a saving of $98.55 a year against what the same space heater would cost at the national average rate. Run the identical appliance in Hawaii and it would cost $2,066 a year; in Nevada it would cost $557. That spread of $1,509 is entirely down to location.
Reducing use by 100 kWh would save $15.91 in energy charges at Texas's average rate, compared with $18.16 at the US average. Whether a replacement appliance pays for itself also depends on its purchase price and the energy it actually saves.
Use the energy and delivery price that applies to your own utility plan in Texas. If your plan has time-of-use prices, calculate each period separately or use a rate weighted by the electricity used in each period. Fixed monthly fees are outside this appliance energy-cost estimate.
| Location | Rate | Per month | Per year |
|---|---|---|---|
| Texas this page | 15.91¢ | $58.12 | $697 |
| US average | 18.16¢ | $66.33 | $795 |
| Nevada cheapest state | 12.72¢ | $46.46 | $557 |
| Hawaii most expensive | 47.18¢ | $172 | $2,066 |
Texas electricity rate trend
Rates in Texas have moved from 15.77¢ to 15.91¢ per kWh between September 2025 and August 2026. The national residential average changed +3.4% from the same month a year earlier.
2025-09 to 2026-08 · cents per kWh
About running a space heater
Electric resistance heaters are 100% efficient at converting electricity to heat, which sounds good but is misleading: a heat pump moves two to four times more heat per unit of electricity. A 1,500W space heater is the single most expensive plug-in load in most homes, and running one continuously through a winter is what usually causes the "why is my bill so high" moment.
How we worked this out
The arithmetic is simple and we would rather show it than hide it. Divide watts by 1,000 to get kilowatts, multiply by hours of use and by the duty cycle to get kilowatt-hours, then multiply by your rate:
1500W ÷ 1000 × 8h = 12.000 kWh/day × 15.91¢ = $1.909 per day
One honest caveat: Texas’s figure is a state average published by the EIA. Your own utility’s tariff, any time-of-use pricing, fixed monthly service charges and local taxes all shift the real number. Put your actual per-kWh rate into the calculator above for a figure that reflects your bill.
How to estimate your space heater electricity use
For a resistance space heater, the setting and the time spent actively heating drive electricity use. A 1,500W setting draws 1.5 kW while the heating element is on; a thermostat can reduce the share of time it stays on.
The 24-hour example represents 24 hours drawing the entered power. It is not a recommendation to leave a portable heater running unattended; follow its manufacturer instructions.
- Use the wattage for your selected setting. At the same actual draw and runtime, oil-filled, ceramic and other resistance heaters use the same electrical energy.
- At an illustrative $0.20/kWh, 1,500W at continuous full power costs $0.30 for one hour or $2.40 for eight hours. A 50% duty cycle halves those energy figures over the same selected hours.
- For a 90-day season at eight full-power hours/day, the same example costs $216. The 365-day equivalent is $876 and should not be mistaken for a winter forecast.
- Comparing a room heater with central heating requires the rooms heated, runtime, central-system efficiency and fuel prices. Wattage alone cannot establish which option costs less.
Calculation and data sources
Daily kWh = watts ÷ 1,000 × hours × duty cycle ÷ 100. Multiply kWh by your rate in dollars per kWh to get cost. The wattage, hours and duty cycle above are editable example assumptions, not EIA measurements of this appliance.
The US and state average prices come from the EIA for August 2026. A state average is a starting point; your bill is the better source for your tariff.
Questions about space heater running costs
How much electricity does a space heater use?
In this example, 1500 watts at a 100% duty cycle uses 1.500 kWh per scheduled hour. At 8.00 hours per day, that is 12.000 kWh per use day. Your model and operating conditions can differ.
How much does it cost to run a space heater for an hour?
The default example costs $0.239 per scheduled hour at the Texas average of 15.91¢/kWh for August 2026. This includes the selected duty cycle. Enter your watts, duty cycle and electricity price for your own estimate.
Does the annual cost assume I use it every day?
The reference tables use 365 days at the stated daily hours; monthly figures use 30.44 days. These are comparison scenarios, not forecasts. For a heater used on 90 days, enter 90 use days per year in the calculator.
Why does electricity running cost vary by state?
For August 2026, the EIA state averages range from 12.72¢/kWh in Nevada to 47.18¢/kWh in Hawaii. Equal electricity use costs more at a higher rate. Your utility tariff can differ from the state average.
How much does a 1,500 watt heater cost for eight hours?
At full power it uses 1.5 kW x 8 hours = 12 kWh. Multiply 12 by your price in dollars per kWh; at an illustrative $0.20/kWh, the cost is $2.40. Thermostat cycling can reduce actual energy use.
What does running a space heater for 24 hours cost?
At a continuous 1,500W, 24 hours uses 36 kWh. At an illustrative $0.20/kWh that is $7.20. A lower setting or cycling changes the calculation; this is an energy estimate, not advice about safe operating duration.
Does a lower-wattage heater always save money?
It costs less per hour while drawing less power, but may need to run longer to provide the same heat. Compare energy used over a comparable heating task, not just the wattage printed on the box.