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Why Should I Not Use Generators Indoors After a Storm?

Last updated October 26, 2026

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The short answer

Carbon Monoxide Is Invisible and Deadly

Generators burn fuel to make electricity, and that burning releases carbon monoxide, or CO. You cannot see it, smell it, or taste it, so it can poison you without any warning. In an enclosed space like a garage, porch, or utility room, CO levels can rise to dangerous levels in just minutes.

Breathing in CO reduces the oxygen in your blood, which can cause headaches, dizziness, nausea, and confusion. At higher levels, it can lead to unconsciousness or death. Health agencies report that hundreds of people die each year from generator-related CO poisoning, many of them after storms.

Open Doors and Windows Do Not Make It Safe

Some homeowners think that opening a door or window will let the CO escape, but that is a dangerous misconception. The airflow is rarely enough to clear the gas, especially if the generator is running continuously. Even a slightly open window can let CO drift back inside.

The only safe place for a portable generator is outdoors, at least 20 feet from your home, with the exhaust pointing away from doors, windows, and vents. Keep it on a dry surface under an open canopy or cover to protect it from rain while still allowing airflow.

  • Place the generator outside, never in a garage or shed
  • Keep it at least 20 feet from any door, window, or vent
  • Point the exhaust away from your home and any neighbors
  • Use a battery-powered CO alarm inside your home
  • Turn off the generator before refueling to avoid fire hazards
  • Do not run it on a porch, balcony, or in a carport

Storm Conditions Can Make the Danger Worse

After a storm, power outages often last for hours or days, and you might be tempted to bring the generator closer to keep it dry or to run extension cords more easily. But rain and wet ground create additional electrical risks, and the urge to stay sheltered can lead to unsafe placement.

Storm season can bring heavy rain and flooding in many regions. A generator placed under a covered patio or in a garage might seem convenient, but the CO hazard remains the same. Always prioritize outdoor placement, even if it means using a longer extension cord.

Recognize the Signs of Co Poisoning

Symptoms of CO poisoning include headache, weakness, dizziness, upset stomach, vomiting, chest pain, and confusion. If you or anyone in your home feels these symptoms while a generator is running, get outside to fresh air immediately and call emergency services. Do not wait to see if symptoms improve.

People who are sleeping or have been drinking alcohol can die from CO poisoning before ever noticing symptoms. Children, the elderly, and people with heart or lung conditions are especially vulnerable. If you suspect CO exposure, leave the area and get medical help right away.

What to Do After a Storm

When the storm passes and the power is out, check your generator before starting it. Look for damage from flooding or debris, and dry it thoroughly if it got wet. Plug appliances directly into the generator or use a heavy-duty outdoor extension cord.

If your home does suffer water damage from the storm, it is important to act quickly to prevent mold and structural issues. You can reach out to local water damage pros for an inspection and cleanup, especially if flooding affected walls, floors, or personal belongings. They can help dry out the space and reduce long-term damage.

  • Inspect the generator for damage before use
  • Use a battery-powered CO alarm and test it regularly
  • Keep a fire extinguisher nearby that is suitable for electrical fires
  • Store fuel in approved containers away from living areas
  • Have a plan for emergency power that does not rely on indoor operation

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Frequently asked questions

Can I run a generator in my garage with the door open?

No, a garage with the door open is still too enclosed. CO can accumulate quickly and seep into your home. Always place the generator outside, at least 20 feet from any opening, to ensure proper ventilation and safety.

How far from the house should a generator be?

Place the generator at least 20 feet from your home, with the exhaust pointed away from doors, windows, and vents. This distance helps prevent CO from entering your living space, even with the wind blowing toward your house.

What should I do if I feel dizzy while using a generator?

Leave the area immediately and get to fresh air. Dizziness is a common sign of carbon monoxide poisoning. Call emergency services and seek medical help right away, even if you start to feel better after being outside.

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