# How much does it cost to run a space heater? (2026)

> A 1,500-watt space heater costs about 27¢ an hour at the 2026 US average rate — around $65 a month at 8 hours a day. Here's the math for yours.

- URL: https://2search.in/knowledge/articles/oct-26/space-heater-electricity-cost
- Genre: Energy savings
- Country: United States
- Published: 2026-10-27
- Updated: 2026-10-27
- Publisher: 2search (https://2search.in)

> **Quick answer:** A standard **1,500-watt** space heater on high uses 1.5 kWh per hour. At the 2026 US average of about **18.2¢ per kWh**, that is roughly **27¢ an hour, $2.18 a day at 8 hours, and $65 a month**. On low (750 W) it is about half that.

> **Key takeaways**
> - Running cost = **watts ÷ 1,000 × hours × your rate per kWh**.
> - All plug-in electric heaters turn electricity into heat at **about 100%** — type changes comfort, not efficiency.
> - Space heaters save money only when you **heat one room** and **turn the main heat down**.
> - A heat pump makes **2–4 times** more heat per kWh than any space heater.
> - Plug heaters **directly into the wall**, never into an extension cord or power strip.

Space heaters are one of the most searched energy questions every winter, and the answer is simple once you know two numbers: your heater's **watts** and your electricity **price per kWh**.

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![How much does it cost to run a space heater? (2026) Breakdown & Visual Guide](/images/articles/space-heater-electricity-cost/diagram.svg)

## The formula

**Cost per hour = watts ÷ 1,000 × price per kWh**

- Watts are printed on the heater's label or box. Nearly all plug-in heaters top out at 1,500 W because that is about the most a standard 120-volt household outlet can safely supply.
- Your price per kWh is on your electric bill. If your bill shows a total only, divide the dollar amount by the kWh used.

## Cost at the US average rate

The U.S. Energy Information Administration expects the average residential electricity price to be **18.2¢ per kWh in 2026**. At that rate:

| Heater setting | Per hour | Per day (8 h) | Per month (8 h × 30 days) |
| --- | --- | --- | --- |
| 1,500 W (high) | $0.27 | $2.18 | $65.52 |
| 1,000 W | $0.18 | $1.46 | $43.68 |
| 750 W (low) | $0.14 | $1.09 | $32.76 |
| 400 W (personal heater) | $0.07 | $0.58 | $17.47 |

## Cost at different electricity rates

Electricity prices vary a lot by state and utility. Here is a 1,500 W heater, 8 hours a day for 30 days:

| Your rate | Per hour | Per month |
| --- | --- | --- |
| 12¢/kWh | $0.18 | $43.20 |
| 15¢/kWh | $0.23 | $54.00 |
| 18.2¢/kWh (US average) | $0.27 | $65.52 |
| 25¢/kWh | $0.38 | $90.00 |
| 30¢/kWh | $0.45 | $108.00 |

These are **worst-case** numbers. Most heaters have a thermostat and cycle off once the room is warm, so in a small, well-sealed room you may use noticeably less.

## Does the type of heater matter?

For running cost, not as much as ads suggest. Every electric resistance heater — ceramic, oil-filled radiator, infrared, fan-forced — turns almost 100% of the electricity it uses into heat. A 1,500 W ceramic heater and a 1,500 W oil-filled radiator use the same energy per hour at full power.

What differs is **how the heat feels**:

- **Ceramic / fan heaters** warm a room quickly but the warmth disappears when they switch off.
- **Oil-filled radiators** take longer to warm up, run silently and keep radiating after they cycle off.
- **Infrared heaters** warm people and objects directly — good for a drafty room or sitting at a desk.

A heater with a **built-in thermostat and low/high settings** saves more than any "energy-saving" label.

## Space heater vs central heating

A space heater saves money only when it lets you **turn the whole-house heat down**. Heating one room you are sitting in for 4 hours with a 1,500 W heater costs about $1.09 at the US average rate. If that lets you set the thermostat several degrees lower for the rest of the house, you can come out ahead.

If you run a space heater *on top of* normal central heating, your bill only goes up. And if your home has a **heat pump**, it is usually far cheaper per unit of heat than a space heater — a heat pump moves 2–3 units of heat for every unit of electricity, while a space heater makes one. See [heat pump vs furnace](/heat-pump-vs-furnace).

## 6 ways to spend less with a space heater

1. **Heat the person, not the house.** Use a heater in the room you are in and lower the main thermostat.
2. **Use the thermostat setting**, not "high" all the time.
3. **Close the door** to the room you are heating.
4. **Use a timer** so it is not running after you leave or fall asleep.
5. **Try a heated blanket** (around 100 W) — at the average rate that is about 2¢ an hour.
6. **Seal drafts** around windows and doors first. See [ways to lower your electric bill in winter](/lower-electric-bill-winter).

## Safety basics

- Plug heaters **directly into a wall outlet** — not an extension cord or power strip.
- Keep at least **3 feet of clear space** around the heater.
- Choose a model with **tip-over and overheat shut-off**.
- Never leave a heater running when you leave the room or go to sleep.
- Keep working smoke alarms on every level of your home.

## Cost by heater size (at 18.2¢ per kWh)

| Heater | Per hour | 8 hours a day | 30 days (8 h/day) |
| --- | --- | --- | --- |
| 400 W panel heater | 7¢ | $0.58 | $17 |
| 750 W (low setting) | 14¢ | $1.09 | $33 |
| 1,000 W | 18¢ | $1.46 | $44 |
| **1,500 W (high)** | **27¢** | **$2.18** | **$66** |

Most heaters cycle on and off with a thermostat, so real costs are often **20–40% lower** than the full-power numbers.

## Space heater vs other heat: cost per unit of heat

| Heat source | Approx. cost per million BTU (2026 typical prices) |
| --- | --- |
| Electric space heater / baseboard | ~$53 |
| Propane furnace (95%) | ~$32 |
| Heat pump (COP 3) | ~$18 |
| Gas furnace (95%) | ~$16 |

So heating a **whole house** with space heaters is usually the most expensive option. Heating **one small room** for a few hours while the rest of the house is cooler can still save money.

> **Example:** Your gas furnace costs about **$5 a day** to keep the whole house at 68°F. You turn it down to 62°F (saving roughly **$1.20 a day**) and run a 1,500 W heater in your home office for **5 hours** on its thermostat (~**$1.00**). You save a little — and stay warm where you work. Run the heater 10+ hours a day and the savings disappear.

## How to choose a safe, efficient space heater

- ☐ Safety listing from **UL, ETL or CSA**
- ☐ **Tip-over switch** and **overheat protection**
- ☐ A **real thermostat** (not just high/low) so it cycles off
- ☐ **Timer** or app control
- ☐ **Cool-touch** housing if you have kids or pets
- ☐ Size: about **10 watts per square foot** of room as a rough guide (1,500 W ≈ 150 sq ft)

## Frequently asked questions

### Does a space heater use a lot of electricity?

A 1,500 W heater on high uses 1.5 kWh an hour — about as much as running a microwave non-stop. Over a month of daily use it can add $40–$100 or more to a bill, depending on your rate and how many hours you run it.

### How much does it cost to run a space heater for 24 hours?

At 1,500 W and 18.2¢ per kWh, about $6.55 if it ran at full power the whole time. With a thermostat cycling it on and off, it is usually less.

### Is it cheaper to run a space heater or central heat?

A space heater is cheaper only if it lets you keep the rest of the house cooler. Heating a whole home with several space heaters is usually more expensive than a furnace and much more expensive than a heat pump.

### Are oil-filled heaters cheaper to run?

Not per hour at the same wattage. They feel more comfortable because they keep radiating heat after switching off, which can mean fewer on-cycles in a closed room.

### Is it safe to leave a space heater on all night?

It's safer to use a timer and a model with tip-over and overheat protection. Never leave one running when you leave the house, and keep it 3 feet from anything that can burn.

### What size space heater do I need?

As a rough guide, 10 watts per square foot — a 1,500 W heater for about 150 sq ft in a well-insulated room.

### Does "eco mode" save money?

Eco modes mostly cycle the heater using a thermostat, which reduces run time. It helps, but the cost per hour at full power stays the same.

## Sources

- [U.S. EIA — Short-Term Energy Outlook, electricity prices](https://www.eia.gov/outlooks/steo/report/elec_coal_renew.php)
- [Carrier — Heat pump efficiency compared with electric resistance heat](https://www.carrier.com/residential/en/us/products/heat-pumps/how-much-does-a-heat-pump-cost/)
- [NFPA — Heating fire safety](https://www.nfpa.org/education-and-research/home-fire-safety/heating)
- [Ready.gov — Home fires](https://www.ready.gov/home-fires)