How to Heat a Home Without Power

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When the furnace stops, the real question isn’t which gadget to buy — it’s which heat sources are actually safe to run indoors. This guide covers how to heat a home without power: the safe options, the dangerous mistakes, and how to combine heating with insulation so you need less of it.

Quick answer

The safest indoor option without power is an indoor-rated propane or kerosene heater paired with a battery carbon monoxide detector, used in a room with a cracked window. A properly installed, vented wood or pellet stove is excellent if you have one. Combine any heat source with sealing one small room rather than trying to heat the whole house. Never burn anything not rated for indoor use inside — that’s the mistake that kills people every winter.

Safe heat sources, ranked by situation

If you have any power source (generator, large power station)

An electric space heater is the safest option available — zero carbon monoxide risk. Look for tip-over and overheat auto shutoff. Check your power source can handle the heater’s wattage continuously.

If you have no power and a fireplace or wood stove

The most self-sufficient option — no fuel supply chain needed if you can gather or have stored wood. Keep the flue clear and have it inspected annually; this isn’t something to improvise during the emergency itself.

If you have no power and no wood-burning appliance

An indoor-rated propane heater (confirm the specific model says “indoor safe” — many propane heaters are outdoor-only) or a kerosene heater using the correct fuel grade. Both require a cracked window for ventilation and a working battery carbon monoxide detector in the room. See our full portable heater comparison.

What never to burn indoors

Charcoal grills, gas grills, camp stoves not rated for indoor use, and generators must never run indoors, in a garage, or near an open window or vent — even briefly, even “just to warm up for a minute.” All produce carbon monoxide, which is odorless and can kill in an enclosed space before you notice anything wrong. This is the single most dangerous and most common mistake people make during winter outages.

Shrink the space you’re heating

Heating one small room is far more effective than trying to warm an entire house with limited heat output:

• Pick a small interior room, ideally away from exterior walls and windows.
• Close the door and block the gap underneath with a towel or draft stopper.
• Cover windows with blankets or plastic sheeting.
• Close vents to unused parts of the house if your HVAC system allows it.
• Everyone in the household stays in that one room — shared body heat genuinely helps.

See our full guide to staying warm during a winter power outage for the complete room-sealing and layering strategy.

Reduce how much heat you need in the first place

• Seal drafts around doors and windows before winter — see our winterize your home checklist.
• Layer clothing properly rather than relying entirely on ambient room heat — see layering for cold weather.
• Use insulated sleeping bags and blankets at night instead of just raising the heater output.
• Keep everyone fed and hydrated — the body generates heat from calories, and dehydration makes you feel colder.

Protecting pipes while you’re focused on people

If the whole house drops toward freezing despite your efforts, pipes become a second risk. Keep a trickle running from vulnerable faucets, and know your shutoff valve in case a pipe does freeze or burst — see our full guide to preventing and thawing frozen pipes.

Fuel storage reminders

• Store propane cylinders outdoors or in a ventilated space, never near an ignition source.
• Keep kerosene in approved containers, clearly labeled, away from living spaces.
• Estimate your runtime needs and store a buffer — propane and sealed canister fuel store for years, so there’s little downside to having extra on hand before winter.

Frequently asked questions

What is the safest way to heat a home without electricity?

An indoor-rated propane or kerosene heater used with a cracked window and a working carbon monoxide detector, or a properly vented wood or pellet stove if you have one installed. If you have any power source, an electric space heater is safest since it produces no carbon monoxide.

Can I use a propane grill to heat my house?

No, never. Grills, camp stoves not rated for indoor use, and any charcoal-burning device produce dangerous levels of carbon monoxide and must never be used indoors, even briefly.

Is it safe to run a generator in the garage for heat?

No, never, even with the garage door open. Generators produce lethal carbon monoxide that can seep into the house through doors, vents, and gaps, causing a number of deaths every winter.

How can I make a single heater warm my house more effectively?

Don’t try to heat the whole house — seal off and heat one small interior room instead, with the door closed, windows covered, and everyone gathered there. This concentrates limited heat output where it actually helps.

Do I need a carbon monoxide detector for every type of indoor heater?

Yes, for any fuel-burning heater, even ones rated for indoor use. Detectors catch malfunctions, ventilation problems, or low-oxygen conditions in a sealed room that even a properly functioning approved heater can create.

How much propane should I store for a winter heater?

Estimate your expected daily runtime and multiply by the number of days you want to cover, then add some buffer. Propane stores for years when sealed, so there’s little cost to keeping extra cylinders on hand before winter.

Bottom line

Choose heat based on what power you actually have: electric if you have any power source, indoor-rated propane or kerosene with ventilation and a CO detector if you don’t, or a properly installed wood stove. Seal off one small room rather than heating the whole house, and never burn anything not explicitly rated for indoor use.

This article is for general informational purposes only. Sources: CDC carbon monoxide safety guidance; CPSC portable heater safety; U.S. Fire Administration winter heating safety.