How Much Does a Space Heater Cost to Run in Texas?

By the TexasPowerCost Editorial Team — independent Texas electricity analysis · Last reviewed October 18, 2026 · how we analyze plans

Last updated: October 3, 2026  ·  8 min read

A space heater is the simplest heating decision in a Texas home and one of the easiest to get wrong on the bill. The math is two numbers — the heater's wattage and your price per kilowatt-hour (kWh) — and the answer to "does it save money" depends on what it replaces.

How much does a space heater cost to run per hour in Texas?

Watts divided by 1,000, times hours, times your rate. A 1,500-watt heater on high uses 1.5 kWh per hour, so at 15.0¢/kWh it costs 22.5¢ an hour; the 1,000-watt setting costs 15¢ and the 750-watt low setting 11.25¢. Your EFL energy rate will differ, and your TDU adds its own delivery charge per kWh.

The per-kWh figure that matters is your marginal rate: the energy charge on your Electricity Facts Label plus the per-kWh portion of your transmission and distribution utility (TDU) delivery charge. Every extra kWh a heater adds is billed at both, which is why the "15¢" examples on this page are a floor rather than a ceiling. Our guide to what appliances cost to run in Texas uses the same arithmetic for everything else in the house.

What does a space heater cost per month at 4, 8 or 24 hours a day?

The table multiplies the hourly figures out for a 30-day month at the three settings most heaters offer. Treat it as the cost of a heater that never cycles off; a heater holding a set temperature in a small room runs less than this, and one losing the fight against a drafty room runs exactly this.

Illustrative: 30 days at a 15.0¢/kWh energy charge, which sits in the range of standard fixed-rate plans filed in Texas as of October 2026; your own EFL rate will differ, and the TDU per-kWh delivery charge is billed on top. Running costs assume the heater draws its rated wattage the whole time.

Notice the kWh column as much as the dollars. A 1,500-watt heater at 8 hours a day adds 360 kWh to the month — more than many Texas apartments use in total in a mild month — which is why it also matters for plan choice (below).

Are ceramic, oil-filled or infrared heaters cheaper to run?

No. The U.S. Department of Energy puts it plainly: electric resistance heating "is 100% energy efficient in the sense that all the incoming electric energy is converted to heat." A 1,500-watt ceramic, oil-filled, infrared, micathermic or fan-forced heater therefore makes the same 1,500 watts of heat at the same cost per hour.

What differs is comfort and control. Radiant and infrared heaters warm the people and objects in front of them, so a desk or sofa feels warm sooner at a lower room temperature; oil-filled radiators heat slowly and keep radiating after they cycle off; fan heaters warm air quickly but lose it just as quickly in a drafty room. The savings, when they exist, come from a thermostat that cycles the unit off and a low setting that holds the room — not from the technology making heat more cheaply. Marketing that promises a "more efficient" resistance heater is describing a feature set, not a lower electric bill per watt. (See the DOE's electric resistance heating page.)

Is a space heater cheaper than central heat?

It depends on what your central heat is. Against resistance central heat (strip heat, baseboards, an electric furnace) a space heater makes heat at the same price per unit, so heating one room instead of the whole house saves money. Against a heat pump it makes heat at two to three times the price and only wins in narrow cases.

The DOE says an air-source heat pump "can deliver up to three times more heat energy to a home than the electrical energy it consumes," and that heat pumps "easily cut electricity use by 50% when compared with electric resistance heating." Translate that to the hourly figures above: the 1,500 watts of heat that costs 22.5¢ from a space heater costs roughly 7.5¢ to 11¢ from a heat pump in mild weather. The gap narrows as temperatures fall — in a hard freeze many Texas heat pumps switch on their own resistance strips, as our heat pump vs resistance guide explains — but on a typical 45°F Texas morning the heat pump wins by a wide margin. Which system you have is printed on the air handler; if you are not sure, that guide shows how to tell.

When does a space heater save money — and when does it cost more?

The rule is one sentence: a space heater saves money when it lets you turn central heat down by more than the heater costs, and loses money when it runs on top of unchanged central heat or replaces a heat pump across most of the house. The table turns that into the common Texas situations.

Can a space heater trip a breaker or start a fire?

Both, and both are common. A 1,500-watt heater draws about 12.5 amps on a 120-volt circuit, which is most of a standard 15-amp circuit's 1,800-watt rating and nearly all of the 1,440 watts electricians treat as the safe continuous load. Add a microwave or hair dryer on the same circuit and the breaker trips.

The fire numbers come from the Consumer Product Safety Commission (CPSC), which in January 2026 reported that portable heaters, including electric space heaters, "are involved in an average of 1,600 fires per year, resulting in an average of 70 deaths and 150 injuries annually from 2020 to 2022." Its rules are short: keep the heater at least three feet from drapes, furniture, bedding and anything else that burns; plug it "directly into a wall outlet — never into an extension cord or power strip"; and turn it off when sleeping. Electric heaters produce no carbon monoxide — that hazard belongs to fuel-burning heaters — so the risks to manage are fire and burns. Look for a tip-over switch and an overheat cutoff on any unit you buy; both are standard on current models and cost nothing to run. (Source: CPSC, January 23, 2026.)

What's cheaper than a space heater for staying warm?

Heating the person instead of the room. An electric blanket or heated mattress pad draws a small fraction of a space heater's wattage — typically well under 200 watts on a high setting, so check the label — which makes a full night's use cost a few cents rather than a few dollars.

The same logic covers the daytime: a heated throw at a desk, a warmer layer, or simply closing the door of the room you are heating all cut the number of kWh the heater has to replace. Free heat matters too — south-facing blinds open on sunny days, closed at night — and the winter thermostat guide covers the settings that keep the central system from undoing any of it. For a drafty back room, weatherizing the room is usually cheaper over one winter than heating the draft.

Does a space heater change which electricity plan is cheapest?

It can, because it moves your monthly usage, and in Texas the cheapest plan depends on usage. A home at 700 kWh that adds 360 kWh of heater use lands at 1,060 kWh — across the 1,000 kWh line where many bill-credit plans switch on their credit, so the plan that looked pricey at 700 kWh may now win.

The reverse happens in spring when the heater goes away and usage drops back under the threshold. This is the 1,000 kWh illusion applied to one appliance, and the fix is the same: compare plans at your real winter and summer usage rather than at the advertised 1,000 kWh number. If you already have a plan, the Bill Analyzer tells you whether a heater-heavy winter month changed which plan wins. Our guide to what uses the most electricity in a Texas home shows where a heater ranks against the water heater and the pool pump.

How to run a space heater for the least money

1. Use it to replace heat, not add it

Heat the one room you are in and turn the central thermostat down several degrees. A heater running on top of unchanged central heat only adds to the bill.

2. Run the low setting with the thermostat engaged

Set the heater to the temperature you want and let it cycle. A 750-watt setting that holds a small room costs half as much per hour as the 1,500-watt setting.

3. Run it only while someone is in the room

A timer or a habit of switching it off when you leave removes the hours that cost the most and deliver nothing.

4. Give it its own wall outlet

A 1,500-watt heater draws about 12.5 amps, most of a 15-amp circuit. Plug it directly into a wall outlet on a circuit that is not already running a microwave, hair dryer or another heater.

Key Takeaways

• A 1,500-watt space heater uses 1.5 kWh an hour: about 22.5¢ an hour, $54 a month at 8 hours a day and $162 a month running nonstop at an illustrative 15.0¢/kWh energy rate.
• Ceramic, oil-filled and infrared heaters of the same wattage cost the same to run — the DOE notes electric resistance heating converts all incoming electricity to heat.
• Against a heat pump, a space heater makes heat at two to three times the price; against resistance central heat it makes it at the same price, so zone heating only reliably saves money in resistance-heated homes.
• CPSC (January 2026): portable heaters are involved in an average of 1,600 fires, 70 deaths and 150 injuries a year (2020–2022); keep them three feet from anything flammable and plug them directly into a wall outlet.

Common Questions

Is it expensive to run a space heater all day?

Yes, if it runs continuously. A 1,500-watt heater uses 1.5 kWh every hour, so 24 hours is 36 kWh — about $5.40 a day at an illustrative 15.0¢/kWh energy rate before delivery charges, or roughly $160 a month. Most heaters cycle on and off once the room is warm, so real use is lower, but an all-day heater in a drafty room is one of the fastest ways to add $50 to $150 to a Texas winter bill.

How much does it cost to run a space heater 8 hours a day for a month?

At 1,500 watts, 8 hours a day for 30 days is 360 kWh, which is about $54 at 15.0¢/kWh (your EFL rate varies, and TDU delivery adds a few cents per kWh). On the 750-watt low setting the same schedule is 180 kWh, about $27. A heater with a working thermostat cycles off part of the time, so the figures are a ceiling for a heater that never stops.

Is a space heater cheaper than central heat?

Only when it replaces central heat rather than adding to it. Heating one occupied room with a 1,500-watt heater while the central thermostat drops several degrees can cut the bill, especially if the central system is resistance heat. Against a heat pump it is a losing trade per unit of heat, because the heat pump delivers two to three units of heat per unit of electricity and the space heater delivers exactly one. Running both at full tilt is the most expensive option of all.

What is the cheapest type of space heater to run?

They all cost the same per hour at the same wattage. The Department of Energy notes that electric resistance heating converts all incoming electricity to heat, so a 1,500-watt ceramic, oil-filled, infrared, micathermic or fan heater produces the same 1,500 watts of heat for the same cost. The types differ in how they spread that heat, how fast a room feels warm and how they behave on a thermostat, not in efficiency. A heater with a good thermostat and a low setting saves money by running less, not by making heat more cheaply.

Does the low (750 W) setting really cut the cost in half?

Per hour, yes: 750 watts draws half the electricity of 1,500 watts, so the hourly cost halves. Whether the monthly cost halves depends on the room. In a small, well-sealed room the low setting may hold the temperature and the heater cycles off; in a large or drafty room it runs nonstop and still falls short, so the high setting on a thermostat can end up using less by reaching the set point and shutting off.

Is it safe to leave a space heater on overnight?

The Consumer Product Safety Commission says to turn heaters off when sleeping. Its January 2026 figures attribute an average of 1,600 fires, 70 deaths and 150 injuries a year to portable heaters from 2020 to 2022. If you need heat overnight, use the central system or an electric blanket, keep any heater three feet from bedding and furniture, and plug it directly into a wall outlet, never an extension cord or power strip.

Key Terms

Kilowatt-hour (kWh) · Bill Credit · Effective Rate · TDU Charge · Electricity Facts Label (EFL) · Full Glossary →

Keep Reading

Electric heating costs: heat pump vs resistance explains the system a heater is competing with, do smart thermostats save money in Texas covers the other half of the zone-heating question, and the Texas winter electricity checklist puts heating decisions on a month-by-month calendar.