Carbon Monoxide Safety During a Power Outage: Where Poisonings Happen

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Carbon monoxide is invisible, odorless, and kills fastest exactly when you’re least able to notice it — while you’re asleep. Power outages are one of the highest-risk windows for CO poisoning, because people improvise heat and cooking sources they wouldn’t normally use indoors. Generators get most of the safety warnings, and for good reason — CPSC data attributes the large majority of outage-related CO deaths to them — but generators aren’t the only source, and this guide focuses on the ones that get far less attention: space heaters, camp stoves and charcoal, gas ovens used for heat, and attached garages. If you’re specifically looking for generator CO safety and placement, our sister site GeneratorAdvice.com has a dedicated generator carbon monoxide safety guide — this article covers everything else.

How dangerous is this, really

The Consumer Product Safety Commission’s most detailed recent analysis (covering 2012-2022) recorded 872 non-fire CO deaths from 699 incidents involving generators and similar engine-driven tools, with generators alone responsible for the large majority. Looking specifically at power-outage-linked incidents, CPSC counted 103 incidents and 139 fatalities over that period — ice and snow storms accounted for 31 incidents (38 deaths), hurricanes and tropical storms for 36 incidents (55 deaths). CPSC’s own 2026 winter-storm safety release still describes generators as killing “nearly 100 consumers… each year.” Worth being upfront about the data: CPSC’s detailed fatality tracking is built around generators and engine-driven tools specifically — it doesn’t publish a comparable ranked death count for charcoal grills, camp stoves, or gas ovens used for heat. Those sources are real and well-documented as dangerous by CPSC’s general safety guidance, just not tracked in the same statistical series.

Space heaters — the fuel type matters

Not all space heaters carry the same risk. Electric space heaters do not produce carbon monoxide — if a power outage still leaves you with generator or battery power for a heater, an electric unit is the safer category by default. Fuel-burning heaters — kerosene and propane models especially — do produce CO and are a real risk if used in an unventilated space or misused indoors. If you use a fuel-burning heater during an outage, it needs to be rated for indoor use, used exactly per its ventilation instructions, and paired with a working CO detector in the same room. When in doubt, an electric heater run off a properly sized battery or generator removes the CO risk from the equation entirely — see our best indoor-safe emergency heaters guide for current picks.

Charcoal grills and camp stoves — why “crack a window” isn’t enough

This is the mistake that catches people who think they’re being careful. CPSC’s guidance is direct: never burn charcoal inside a home, garage, vehicle, or tent, and never run a camp stove indoors unless it’s specifically rated for enclosed-space use. A cracked window does not create enough air exchange to offset the volume of CO a charcoal fire or a camp stove produces in an enclosed room — by the time you’d notice a problem, dangerous levels can already be building. If you need an alternative cooking method during an outage, see our cooking without power guide, which covers the options that are actually safe to use indoors versus the ones that absolutely aren’t.

Gas ovens and stoves used for heat

Using a gas oven or range as a supplemental heat source is a common improvisation during a cold-weather outage, and it’s a genuinely dangerous one. Gas ovens and stovetops aren’t designed or vented for space heating, and running one for that purpose is a well-documented CO risk — tenant-advocacy and fire-safety guidance is blunt about this: never use your oven for home heating, regardless of how cold it gets.

Attached garages — even with the door open

Never leave a vehicle running in an attached garage, even with the garage door open — an open door doesn’t provide reliable ventilation against a running engine, and CO can migrate into the attached living space faster than most people expect. This applies during an outage too, when running a car to charge a phone or warm up briefly can feel like a low-risk shortcut. It isn’t — move the vehicle fully outside if you need to run it for any reason.

Detector placement that actually protects you

CPSC and UL guidance is consistent: install a CO alarm on every level of your home and outside each separate sleeping area, and use interconnected alarms where possible so that one triggering sounds all of them. Don’t install a detector near heating vents, or where furniture or drapes could block it, and don’t place one directly above or right next to a fuel-burning appliance. Both battery-powered and hardwired-with-battery-backup units are acceptable — but if you’re specifically prepping for outages, a battery-backup or fully battery-powered unit is the one guaranteed to still work when the power itself is out.

Early symptoms and why sleep is the dangerous window

Early CO poisoning symptoms are easy to mistake for something else: headache, dizziness, weakness, nausea, vomiting, chest pain, and confusion. The reason CO is so often fatal during sleep specifically is that these symptoms progress to unconsciousness before most people would otherwise recognize something is wrong and get to fresh air — you can’t act on a warning sign you’re asleep through. This is exactly why detector coverage near every sleeping area matters more than almost any other placement decision.

Common mistakes

• Assuming a cracked window is enough ventilation. It isn’t, for charcoal, camp stoves, or any other significant indoor CO source.
• Confusing electric and fuel-burning heaters. Only fuel-burning types produce CO — know which kind you own before an outage, not during one.
• Relying on smell to detect CO. Carbon monoxide has no odor — you cannot smell your way to safety, a working detector is the only reliable warning.
• Placing detectors too far from sleeping areas. The highest-risk window is while you’re asleep — coverage near bedrooms is non-negotiable.
• Running a generator without reading generator-specific guidance. That’s a big enough topic on its own — see GeneratorAdvice.com’s generator carbon monoxide safety guide before you run one.

Recommended detectors

A few current, well-reviewed options worth keeping on hand: the First Alert SMCO210 battery-powered combination smoke/CO alarm, the Kidde 900-CUAR battery combo alarm, and for travel or a hotel/RV situation, the compact Kidde portable battery CO detector.

Related OO topics

Heating and cooking safely without power: best indoor-safe emergency heaters, cooking without power, how to stay warm without power, winter power outage survival guide. Fuel handling: fuel storage safety for emergency power. Cross-cluster (GA — generators): generator carbon monoxide safety.

Key takeaways

• CPSC data shows generators cause the large majority of outage-related CO deaths, but charcoal, camp stoves, gas ovens used for heat, and running vehicles in attached garages are all real, documented risks too.
• Electric space heaters produce no CO; fuel-burning heaters (kerosene, propane) do and need proper ventilation and detector coverage.
• Never burn charcoal or run a camp stove indoors — a cracked window is not sufficient ventilation.
• Never use a gas oven or stove for home heating, and never run a vehicle in an attached garage even with the door open.
• Install battery-backup CO detectors on every level and outside every sleeping area — CO has no smell, and sleep is the highest-risk window since symptoms progress before you’d wake to them.

FAQ

Can I smell carbon monoxide? No — it’s completely odorless and colorless. A working detector is the only reliable way to know it’s present.

Is it safe to run a camp stove indoors if I crack a window? No. CPSC guidance is explicit that camp stoves and charcoal should never be used indoors unless the stove is specifically rated for enclosed-space use — a cracked window doesn’t provide enough air exchange.

Do electric space heaters produce carbon monoxide? No. Only fuel-burning heaters (kerosene, propane, and similar) produce CO. Electric heaters carry no CO risk, though they still carry normal fire/overload risks and need their own basic precautions.

Where should I put CO detectors in my home? On every level of the house and just outside each separate sleeping area, ideally interconnected so one alarm triggers all of them. Avoid placement near heating vents or fuel-burning appliances.