How to Stay Warm Without Power

The grid goes down in January and the first thing most people reach for is the thing most likely to kill them. Every winter, emergency rooms fill with carbon monoxide cases from generators run in garages and charcoal grills dragged inside, and fire departments answer calls for space heaters left too close to a couch. The frustrating part is that the safest way to stay warm in a cold house is also the cheapest and the one almost nobody stages in advance. Here is how to actually do it.

Quick Answer

To stay warm without power, stop trying to heat the house and start heating a person. Pick one small interior room, seal the drafts, cover the windows, and move everyone into it. Wear layers with a hat, stay dry, and sleep in rated sleeping bags rather than loose blankets. Add heat only from sources designed and vented for indoor use. Never burn fuel indoors that was not built for it: no generators, no charcoal grills, no camp stoves, no gas ovens. The CDC's rule is that generators run outdoors only, more than 20 feet from any window, door, or vent.

Key Takeaways

  • Shrink the space before you add heat. One closed-off interior room with covered windows and towels under the door holds body heat far better than an open floor plan you cannot possibly warm.
  • Carbon monoxide is the actual danger, not the cold. CO is odorless and colorless. The CDC says never run a generator, charcoal grill, camp stove, or other fuel-burning device inside a home, basement, or garage, or outside within 20 feet of a window, door, or vent.
  • Space heaters cause a disproportionate share of deaths. NFPA data for 2019 to 2023 shows space heaters and heating stoves were involved in about 29 percent of home heating fires but caused roughly 77 percent of the deaths.
  • Dry beats thick. Wet clothing pulls heat out of you fast. The CDC's guidance is to remove wet clothing immediately and cover exposed skin.
  • Infants and older adults are the ones who get hurt. The CDC notes that babies under a year old should never sleep in a cold room, and that both infants and the elderly are at elevated risk indoors, not just outside.

Step One: Stop Heating the House

This is the mental shift that changes everything. A house without power is a large, leaky, uninsulated box, and you are not going to win a fight against it. You do not need to. You need one warm room and warm people in it.

Pick the smallest interior room you can live in for a couple of days. Interior matters: a room with one exterior wall loses heat far more slowly than a corner room with three. Basements stay more temperature-stable than upper floors but can be damp, so a central bedroom or a den is usually the right call. Then seal it:

  • Close off every room you are not using. The CDC's winter storm guidance is explicit about closing unneeded rooms and avoiding unnecessary opening of doors and windows.
  • Stuff towels or rags into the cracks under doors. That gap is a chimney for warm air.
  • Cover the windows at night. Close draperies or hang blankets over the glass. Glass is the weakest point in the thermal envelope of any room by a wide margin.
  • Open south-facing curtains during the day if the sun is out, then close them again at dusk. Free solar gain is genuinely worth a few degrees.
  • Put something between you and the floor. Sleeping directly on a floor drains heat by conduction all night. Foam pads, couch cushions, or a stack of blankets underneath you do more than another blanket on top.

None of this requires shopping. It requires deciding to do it before the house has already cooled off, which is the part people get wrong.

Step Two: Dress Like You Are Outside

People put on a heavier sweater and stop there. The layering system that works in the backcountry works in your living room, because the physics are identical.

  • Base layer: something that moves moisture off your skin. Wool or synthetic. Cotton against the skin holds sweat and turns into a cooling system, which is the last thing you want.
  • Mid layer: the insulation. Fleece, wool, or a puffy jacket. This is where most of your warmth comes from, and two thin mid layers usually beat one thick one because they trap more air.
  • Outer layer: a shell if there is any wind or moisture, which matters more than you would think if you are moving in and out of the house.
  • Hat, always. Your head is uninsulated skin over a lot of blood flow. A hat indoors looks silly and works.
  • Feet: wool socks and something on top of them. Cold feet make the whole body feel cold and drive people toward bad heating decisions.
⚠️ SAFETY: Remove wet clothing immediately and cover exposed skin. Shivering, exhaustion, confusion, fumbling hands, memory loss, slurred speech, and drowsiness are signs of hypothermia; in babies, look for bright red, cold skin and unusually low energy. Verify against current CDC winter weather guidance and seek medical help for suspected hypothermia.

Step Three: Sleep Warm

The coldest stretch of any outage is between about 3 a.m. and dawn, when the house has shed its stored heat and nobody is moving around to generate any. This is where a real sleeping bag beats a pile of blankets by a wide margin.

A bag rated for temperatures below what you expect indoors traps a fixed envelope of warm air around you instead of leaking it out the sides every time you turn over. Two people in the same small room warm that room measurably; families genuinely should sleep in one space during a hard outage rather than spreading out across bedrooms. Add a hot water bottle if you have any way to heat water safely, put it near your core rather than your feet, and change into dry sleep clothes rather than wearing the ones you sweated in all day.

⚠️ SAFETY: Infants under one year old should never sleep in a cold room. The CDC advises dressing babies in warmer clothing such as footed pajamas and one-piece wearable blankets rather than adding loose bedding to a crib. Verify against current CDC and pediatric safe-sleep guidance.

Step Four: Adding Heat Without Killing Anyone

Here is where a cold night turns into an emergency. Carbon monoxide is odorless, colorless, and gives you no warning as it builds up. It kills hundreds of people a year in the United States and sends thousands more to hospitals, and outages are exactly when the spike happens, because that is when people improvise.

⚠️ SAFETY: Never operate a generator, charcoal grill, camp stove, or any other gasoline-burning or charcoal-burning device inside a home, basement, or garage, and never outside within 20 feet of a window, door, or vent. An open garage door does not clear CO fast enough. Verify against current CDC and CPSC guidance and your equipment's manufacturer instructions.
⚠️ SAFETY: Never use a gas oven or stovetop burner to heat a room. It is not a heating appliance, it is not vented for continuous operation, and it produces CO indoors. Verify against current CDC guidance and your appliance's manufacturer instructions.
⚠️ SAFETY: Install battery-powered or battery-backup CO alarms near every sleeping area before you ever need a generator. If anyone becomes dizzy, weak, nauseated, or confused, get everyone into fresh air immediately and call emergency services. Verify placement and testing against current CDC guidance and the alarm's manufacturer instructions.

The fire risk is separate from the CO risk and just as real. NFPA's figures for 2019 to 2023 put US home heating equipment fires at an annual average of roughly 38,900 incidents, 432 civilian deaths, and about $1.1 billion in property damage. Space heaters and heating stoves were involved in about 29 percent of those fires but accounted for roughly 77 percent of the deaths and 71 percent of the injuries. More than half of home heating fire deaths came from equipment placed too close to something that burns: furniture, bedding, clothing, curtains.

⚠️ SAFETY: Keep anything that can burn at least three feet from any heater, and never leave a space heater running while you sleep or leave the room. Verify against current NFPA guidance and your heater's manufacturer instructions.

What Actually Works: A Heat Source Comparison

Heat source Works with the grid down? Safe indoors? What to know
Layers, sleeping bags, sealed small room Always Yes The baseline everything else builds on. Costs nothing to stage and cannot poison you.
Wood stove or fireplace, professionally installed Yes Yes, if properly vented and maintained Needs a clean, inspected chimney and seasoned dry wood staged before the storm. Keep the hearth clear.
Gas furnace with a battery or generator backup Only with backup power Yes, it is a vented appliance Most furnaces need grid power only for the blower and ignition, so a modest backup source can restore whole-home heat.
Electric space heater on a generator Yes, if the generator is sized for it Heater yes, generator outdoors only Heaters draw heavily, often 1,500 watts. Check your generator's rated output before assuming it will carry one.
Vented propane or kerosene heater rated for indoor use Yes Only models explicitly rated and vented for indoor use Follow the manufacturer's ventilation instructions exactly, and pair with a working CO alarm.
Portable generator run indoors or in a garage Yes No. Never. Outdoors only, more than 20 feet from windows, doors, and vents, exhaust pointed away from the house.
Charcoal grill, camp stove, or gas oven as a heater Yes No. Never. These produce carbon monoxide indoors and are a recurring cause of outage-related deaths.
Candles Yes Light only, not a heat plan Negligible heat, real fire risk. Battery lanterns and headlamps are the better answer for light.

What to Stage Before You Need It

Almost all of this is cheap and none of it expires. Buy it once, put it somewhere you can find in the dark, and forget about it.

  • A sleeping bag per person rated below your realistic indoor low, plus foam pads to get bodies off the floor.
  • Wool socks, hats, and a base layer set per person, kept together rather than scattered through drawers.
  • Battery-powered or battery-backup CO alarms, tested, near sleeping areas.
  • Headlamps and battery lanterns so nobody reaches for candles.
  • A roll of painter's tape and a few old blankets specifically for covering windows, so you are not deciding at 11 p.m. which good blanket to sacrifice.
  • If you have a wood stove: dry, seasoned wood under cover and an inspection done before winter, not during it.
  • A way to heat water safely, which for most people means a camp stove used outdoors and carried back in.

Who Is Most at Risk

Cold indoors is not evenly dangerous. The CDC is clear that exposure to cold, indoors or out, can cause serious or life-threatening problems, and that infants and older adults carry the most risk. Older adults lose heat faster, may not feel the cold as sharply, and often have conditions or medications that blunt the body's response. If you have a neighbor in that category, checking on them during a multi-day outage is the single highest-value thing you can do with twenty minutes.

Know the signs of hypothermia so you catch it in someone else: shivering, exhaustion, confusion, fumbling hands, memory loss, slurred speech, and drowsiness. In infants, watch for bright red, cold skin and very low energy. Confusion is the one people miss, because the person experiencing it cannot self-report it.

FAQ

How cold does a house get without heat?

It depends entirely on your insulation, outdoor temperature, and wind, so no honest answer is a single number. A well-insulated modern house may drop only a few degrees in the first several hours, while an older drafty one can approach the outdoor temperature within a day. The practical takeaway is that you should measure it rather than guess: keep a cheap indoor thermometer where you can see it, and start executing your warm-room plan while the house still has heat in it, not after.

Can I use my gas stove or oven to heat the room?

No. This is one of the most common and most dangerous improvisations during an outage. A kitchen range is not a space heater, it is not vented for sustained operation, and running it produces carbon monoxide inside your home. Use a vented appliance designed for heating, or use the no-fuel methods in this article.

How far from the house does a generator need to be?

The CDC's guidance is outdoors only, more than 20 feet from any window, door, or vent, with the exhaust directed away from the building. Not the garage with the door open, not a covered porch, not a crawlspace. Pair it with a working CO alarm inside, because you cannot smell the failure mode.

Do blankets over the windows really help?

Yes, and it is one of the highest-return moves on the list. Windows are the thinnest part of a room's thermal envelope, and the CDC's winter storm guidance specifically recommends closing draperies or covering windows with blankets at night. Uncover south-facing windows during daylight to collect what sun there is, then cover them again at dusk.

Is it better for everyone to sleep in one room?

Generally yes. Bodies are heat sources, and concentrating them in one small, sealed room raises that room's temperature while shrinking the volume you are trying to keep warm. It also means nobody is alone if they start showing signs of hypothermia overnight, which matters more than the thermal argument does.

What about my pipes while I am doing all this?

Closing off rooms can leave plumbing in unheated spaces at risk of freezing, which is a real tradeoff worth naming. Standard cold-weather practice is to let faucets on vulnerable runs drip and to open cabinet doors under sinks on exterior walls so household air reaches the pipes. If you shut a room completely, know which pipes run through it.

The Bottom Line

Staying warm without power is mostly a discipline problem, not an equipment problem. Shrink the space, seal it, dress properly, sleep in real bags, and check on the people around you who are most at risk. Then add heat only from equipment built and vented to run indoors, because the improvised heat source is what turns an uncomfortable night into a fatal one. Stage the cheap stuff now, while it is warm out and you are not making the decision in the dark. Be prepared. Stay savage.

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