A 1,500-watt space heater running from 11 p.m. to 7 a.m. costs $2.18 a night at the average U.S. electricity price this year. One side of a queen heated blanket cranked to high for the same eight hours costs about 19 cents. That gap is the whole argument in most electric blanket vs space heater comparisons, and it’s true. It’s also incomplete in the one way that decides if you save anything: the blanket only pays if you let the rest of your house get cold while you sleep. If the thermostat stays at 70, the cheap blanket is just a new line on your electric bill.
I ran the numbers for this winter, and they land somewhere most reviews don’t: a heated blanket plus a 7 to 10 degree overnight thermostat drop beats both the space heater and the “just leave the heat on” habit. The space heater, the one sold as the thrifty option, is the most expensive way to feel warm in most American homes.
This winter’s heating bills are splitting, and electricity is on the wrong side
The U.S. Energy Information Administration put out its winter fuels outlook on October 6, and the headline is a split. Households heating with natural gas are expected to spend about 9% less than last winter, and propane users about 3% less, mostly because fuel is cheaper. Heating oil households are looking at roughly 21% more. Electricity is going the other way too: EIA expects homes that heat with electricity to spend about 4% more, with the West up 9%.
The number that matters for this fight sits in the October Short-Term Energy Outlook: residential electricity averages 18.2 cents per kilowatt-hour in 2026 and 18.7 cents in 2027. Every plug-in heating gadget you own runs on that rate. Meanwhile the residential natural gas price is forecast at $13.20 per thousand cubic feet in the first quarter of 2027, when your furnace works hardest.
Why a space heater makes heat at about four times your furnace’s price
A space heater is 100% efficient. Every watt becomes heat, which sounds like a win until you check what a watt costs. The Missouri Department of Natural Resources calls electric resistance heat “the most expensive form of heating” for exactly this reason.
The math, using EIA’s prices: a thousand cubic feet of gas holds about 1.036 million BTU, so $13.20 buys a million BTU for about $12.74. Run that through a 95% efficient furnace and the heat that reaches your rooms costs about $13.41 per million BTU. Getting the same million BTU from electricity takes 293 kilowatt-hours, which at 18.2 cents comes to $53.34. That’s four times the gas price. Even an older 80% furnace keeps the ratio above three to one.
In plain terms: the 12 kilowatt-hours your space heater burns overnight cost $2.18. The same amount of heat from a modern gas furnace would cost about 55 cents. A space heater only comes out ahead if it lets you drop the whole-house thermostat by a lot, and most people plug one in on top of the furnace, not instead of it. Missouri’s energy office says it bluntly: run a space heater without turning the thermostat down and “you will increase your total bill.”
(If you heat with oil this winter, or with baseboard electric, the furnace math above doesn’t apply to you. Your heat is already expensive, so every degree you skip overnight is worth even more.)
The electric blanket vs space heater math, run for a whole winter
A heated blanket doesn’t heat air. It heats you, which is the only thing in the bedroom that cares. Biddeford’s queen microplush blanket at Kohl’s is rated at 130 watts per side, with a separate controller for each side and a 10-hour auto shutoff. Sunbeam’s queen microplush, the one you’ll see stacked at Walmart for $99.44, has a 12-hour shutoff.
Take the worst case: one side running flat out at 130 watts for eight hours. That’s 1.04 kilowatt-hours, or 19 cents a night at 18.2 cents per kWh. Both sides on high is 38 cents. In real life the blankets cycle on and off once they’re warm, so you’ll usually come in under those numbers. Now stretch it across a heating season from November 1 through March 31, which is 151 nights. One side on high costs $28.58 for the winter. The space heater, eight hours a night, costs $329.78. That’s a gap of more than 11 to 1.
But the blanket’s electricity isn’t where your savings come from. The Department of Energy says you can save “as much as 10% a year on heating and cooling by simply turning your thermostat back 7°-10°F for 8 hours a day.” The thermostat setback is the money. The blanket is the tool that makes a 60-something-degree bedroom pleasant instead of miserable. So the honest payback test looks like this: in year one, the Sunbeam at $99.44 plus $28.58 of electricity is $128.02. At DOE’s 10% ceiling, you break even in the first winter if your household spends about $1,280 a year on heating and cooling. From year two on, the blanket only has to cover its $28.58 of electricity, which a 10% setback clears on any annual heating and cooling bill above about $286. Put the money you stop sending the utility into a sinking fund and you’ll see it add up.
A cold bedroom is what sleep doctors already recommend
The colder room also happens to be what sleep specialists ask for. Brian Chen, MD, a sleep specialist at Cleveland Clinic, puts the ideal bedroom at roughly 60 to 67 degrees, because “your core body temperature is supposed to drop to its lowest point during sleep.” A room you’ve let cool to 62 lines up with that. The warm spot is under the covers, not in the air you’re breathing.
The trick I’d steal: preheat the bed on high 20 minutes before you get in, then knock it down to low or let it shut off. You get into a warm bed, and your body still gets the cooler night it wants. (If sleep has felt off lately, the sleep and hormone connection is worth a read too.) If you have a medical condition that affects how you sense heat, ask your doctor before sleeping on any heated bedding.
The safety gap between them is bigger than the price gap
Cost isn’t the only reason I’d pick the blanket for overnight. A FEMA U.S. Fire Administration report covering 2017 to 2019 found portable heaters were involved in only 3% of residential heating fires but 41% of the fatal ones, averaging about 65 deaths a year. The leading cause, in 48% of those fires, was the heater sitting too close to something that burns: bedding, curtains, a pile of laundry. That’s a bedroom description.
Heated blankets aren’t risk free either. In March 2023, the Consumer Product Safety Commission announced a recall of about 350,000 Bedsure heating blankets and pads after 137 reports of products catching fire, melting, or overheating. Buy a blanket with an auto shutoff, check the CPSC recall list before you buy anything secondhand, and retire one with a frayed cord or a controller that runs hot.
If you already own a space heater, keep it for the 30 minutes you spend in a cold bathroom or the hour at a drafty desk, three feet from anything fabric. Just don’t make it your overnight plan.
Tonight, set the thermostat to drop 8 degrees at bedtime and come back up 30 minutes before your alarm, then put a heated blanket on the bed. That two-part setup is the real winner in electric blanket vs space heater, and the space heater can go back in the closet until somebody’s toes are freezing.