Can a fireplace cause carbon monoxide poisoning while sleeping?

Author: Zetta Gusikowski IV  |  Last update: Friday, January 9, 2026

While it might be tempting to fall asleep near your gas fireplace on a chilly evening, it's actually putting your family at higher risk for carbon monoxide poisoning, fire, and smoke inhalation. A vent-free gas fireplace with easily accessible front doors shouldn't be operated more than three consecutive hours.

Is it safe to sleep in a room with a fireplace?

What are the risks of sleeping in a room with a fireplace? The main risks include carbon monoxide poisoning if the fireplace is not venting properly. In addition, look out for fire hazards from stray sparks or embers, and poor air quality from smoke.

Is it safe to leave the fireplace on overnight?

Leaving a fireplace burning overnight is not recommended due to the potential risks involved. Both wood-burning and gas fireplaces can pose danger if left unattended. One significant risk is the possibility of accidental fires, which can spread quickly and be fatal.

How do I know if my fireplace is leaking carbon monoxide?

Brown, Sooty Stains

Appliances that run on combusting fuel should have clear exhaust. If you see brownish-yellow or dark stains around a furnace, fireplace or water heater, there may be combustion issues. This can signal a carbon monoxide issue.

Is it bad to sleep with the gas fireplace on?

Running a gas fireplace all night can pose several risks. Here are some of the most significant ones: Carbon Monoxide Poisoning: Gas fireplaces produce carbon monoxide (CO), a colorless, odorless gas that can be deadly.

Carbon Monoxide Poisoning: Everything You Need to Know

Is it safe to have a gas fireplace in bedroom?

Are bedroom fireplaces safe? They can be if installed and used properly. Always follow manufacturer guidelines and local building codes. Install smoke and carbon monoxide detectors in your bedroom.

Should you open a window when using a gas fireplace?

Englund suggests starting by opening windows in the room where the fireplace is located, and perhaps opening some other windows on the same floor to create cross-ventilation. Turn on overhead ceiling fans or other ventilation if possible.

What are two warning signs of carbon monoxide poisoning?

The most common symptoms of CO poisoning are headache, dizziness, weakness, upset stomach, vomiting, chest pain, and confusion. CO symptoms are often described as “flu-like.” If you breathe in a lot of CO, it can make you pass out or kill you.

How do I know if my fireplace is leaking gas?

A rotten egg odor—or similar-type smell—is a definite leak indicator. Listen for hissing or whistling sounds. Look for any dust, dirt, or other debris at the fireplace base. Check for dead or yellowed grass and plants near outdoor gas lines.

How long does it take for carbon monoxide to build up in a house?

Small carbon monoxide leaks can fill every room in your house with poisonous gas within eight hours. Severe leaks can cause this problem in just five minutes. The EPA states that exposure to concentrations of nine ppm or more for eight hours is enough to produce harmful health effects for at-risk individuals.

Is it okay to go to bed with embers in the fireplace?

Leaving embers in the fireplace overnight is not safe. It presents a fire hazard as embers can reignite and cause fires if left unattended. Always extinguish embers completely before going to bed to prevent potential fire risks.

Can smoke from a fireplace cause carbon monoxide?

Most people are aware of the dangers of gas appliances, but it usually comes as a surprise that fireplaces and chimneys are sources of carbon monoxide poisoning, also. That's right chimneys can push carbon monoxide back inside the home!

Is it bad to leave a fireplace on all night?

Leaving a fireplace burning overnight can present risks and hazards. Some of these include: Risk of fire: If the fireplace is not properly maintained or if there is an excessive buildup of fuel, it is possible for a fire to start. Risk of carbon monoxide poisoning: Carbon monoxide is produced when fuel is burned.

Can you go to bed with fireplace on?

Never leave a fireplace fire unattended. Make sure it's completely out before going to bed or leaving the house. If you leave the room while the fire is burning or the fireplace is still hot, take your small child with you. Put fireplace tools and accessories out of a young child's reach.

Is it safe to sleep in a house after a fire?

After a fire, sleeping in a house exposes you to soot and smoke, which are very dangerous elements. After a fire, it's natural for these two to remain, together with bad odor. The more you stay inside the house, the more smoke and soot get into your system, resulting in devastating health effects.

Is it safe to sleep with a gas fireplace on?

There are two basic rules for leaving a fireplace operating during the night. DON'T leave the unit on overnight. DO leave the flue open so that excess carbon monoxide is vented. The main concern with a gas-burning appliance is the exhaust of carbon monoxide and leaving the unit on overnight is simply risky.

Is it normal to smell a little gas from fireplace?

It's natural to be worried when you smell gas in the home, but in this case, the odds are that the condition is harmless. In fact, a faint gas smell is an unavoidable consequence of using gas fireplace logs. More than anything, it's a sign your fireplace is working the way it should.

How to detect carbon monoxide without a detector?

Signs of carbon monoxide:
  1. Stuffy or stale air.
  2. A pilot light keeps going out.
  3. More condensation than usual on your windows.
  4. Soot build up around a fireplace, chimney, or other fuel-burning equipment.
  5. Fuel-burning equipment has a back-draft (flame flares up when a window or door opens and adds air).

How to detect carbon monoxide with iPhone?

Go to the Home app on your iPhone or iPad. , then tap Home Settings. Tap Safety & Security. Tap Sound Recognition, then turn on Smoke & CO Alarm.

Can I call the fire department to check for carbon monoxide?

Yes, the fire department can check for carbon monoxide. If you suspect the presence of carbon monoxide in your home or building, it's essential to act quickly. Evacuate the area, ensure everyone's safety, and call your local emergency services or fire department.

How do I make sure my gas fireplace is safe?

Do:
  1. Use safety screens. As of 2015, vented gas fireplaces are required to have a protective screen over the glass, which can reach temperatures of up to 500°F during use. ...
  2. Have the fireplace inspected annually. ...
  3. Install carbon monoxide detectors. ...
  4. Touch an active fireplace. ...
  5. Put furniture too close. ...
  6. Leave children unmonitored.

Does cracking a window help with carbon monoxide?

Does Opening Windows Help With Carbon Monoxide? Opening windows helps the carbon monoxide quickly leave your home (as does opening doors). However, don't leave your exit path when getting out during this emergency to open as many windows as you can.

When should you close the vent on a fireplace?

If the flue is left open after the fire goes out, all the heat generated will escape. Closing the flue will keep the heat inside; you must be careful not to close it too quickly, otherwise you may trap smoke and carbon monoxide in your home. It's best to keep the flue closed when the fireplace is not in use.

Previous article
Can rotting wood be saved?
Next article
Can you fix your AC by yourself?