What are the symptoms of carbon monoxide poisoning from a heater?

Author: Ms. Anjali Aufderhar MD  |  Last update: Friday, July 3, 2026

Key points about carbon monoxide poisoning A common source is unvented space heaters. Symptoms of CO poisoning include headache, dizziness, weakness, nausea and vomiting, rapid heartbeat, shortness of breath, seizures, chest pain, disorientation, and loss of consciousness.

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.

Will opening a window help with carbon monoxide?

If you experience symptoms that you think could be from CO poisoning: DO GET FRESH AIR IMMEDIATELY. Open doors and windows, turn off combustion appliances and leave the house.

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

These warning signs include: Heavy condensation on the windows (found in the room with your furnace) Yellow or brown soot-like stains found around your furnace. A yellow pilot light (instead of a blue flame)

How long after carbon monoxide exposure do you get sick?

1,600 ppm: Within 20 minutes after carbon monoxide exposure, you may feel a severe headache or migraine, increased nausea and feelings of dizziness. Potential death within one hour. 3,200 ppm: After only 5 to 10 minutes, headache, nausea, and dizziness may occur.

Carbon Monoxide Poisoning: Everything You Need to Know

Can I go to sleep after carbon monoxide exposure?

Carbon monoxide is dangerous because a person may not recognize drowsiness as a symptom of poisoning. Consequently, someone with mild poisoning can go to sleep and continue to breathe the carbon monoxide until severe poisoning or death occurs.

How to clear carbon monoxide from the body?

Treatment for carbon monoxide poisoning is breathing in pure oxygen. A healthcare provider will give you an oxygen mask to breathe through.

How to test for carbon monoxide without a detector?

Any of the following could be a sign of a carbon monoxide leak:
  1. Floppy yellow or orange flame on your gas hob or oven, rather than a crisp blue flame.
  2. Dark, sooty staining on or around gas appliances.
  3. Pilot lights that frequently blow out.
  4. Increased condensation inside windows.

Can a heater leak carbon monoxide if it's off?

However, carbon monoxide can travel throughout your home via your HVAC system, so it can still create a dangerous situation even when your furnace is off. You need to immediately leave your home and contact a skilled professional to deal with a furnace carbon monoxide leak.

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.

Does air conditioning remove carbon monoxide?

While air conditioners can't create carbon monoxide (like gas-powered furnaces or boilers can), they can help circulate it throughout your home if you already have a carbon monoxide leak.

How to tell if carbon monoxide is in the air?

The best way to alert you and your family to unsafe levels of CO is to install a carbon monoxide detector. It works like a smoke alarm, sampling the air in your home and creating a loud alarm when levels of the gas are detected. It's important to evacuate your home immediately when your CO alarm sounds.

How long does it take to get carbon monoxide out of your system?

The carbon monoxide in your body leaves through your lungs when you breathe out (exhale), but there is a delay in eliminating carbon monoxide. It takes about a full day for carbon monoxide to leave your body. 1.5 HOW CAN CARBON MONOXIDE AFFECT MY HEALTH?

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 you check your house for carbon monoxide poisoning?

The main tool used in these tests is an electronic portable toxic multi-gas monitor. This device differs from the consumer-level carbon monoxide detectors in that it can be calibrated to detect trace carbon monoxide gas from nearly zero parts per million (ppm) and at increments as small as 1 ppm.

How do I know if my heater is producing carbon monoxide?

According to the CDC, carbon monoxide is a silent killer that takes hundreds of lives per year. Unfortunately, you cannot tell just by looking at your furnace whether it is leaking carbon monoxide. You need a carbon monoxide detector or other special equipment to test the levels yourself.

Will turning off the gas stop carbon monoxide?

If your boiler is switched off at the mains, your boiler will not be burning fuel and therefore no waste carbon monoxide gas will be produced.

Does carbon monoxide rise or sink?

You should also place a detector in any room situated directly above your garage. The specific gravity of Carbon Monoxide is 0.9657 (with normal air being 1.0), this means that it will float up towards the ceiling because it is lighter than regular air.

Can a cell phone detect carbon monoxide?

Co Checker is a free Android app developed by Meter App, falling under the category of Utilities & Tools. It is a simple and handy tool that helps detect the presence of carbon monoxide in the air.

What is the fastest way to test for carbon monoxide?

To confirm the diagnosis, the health care team might test a blood sample for carbon monoxide. This test should be done as soon as possible after removing the person from the suspected exposure environment.

Does carbon monoxide make you sleepy?

Carbon monoxide (CO) is an odorless, colorless gas that can cause sudden illness or death when inhaled. This is called CO poisoning. Recognize carbon monoxide poisoning symptoms, including: headache, nausea, dizziness, vomiting, confusion, and tiredness.

What are two warning signs of carbon monoxide poisoning treatment?

Symptoms of CO poisoning include headache, dizziness, weakness, nausea and vomiting, rapid heartbeat, shortness of breath, seizures, chest pain, disorientation, and loss of consciousness. CO poisoning needs to be treated right away by getting outside to fresh air and calling 911.

Can you recover from carbon monoxide on your own?

If you have a mild case of CO poisoning, you'll feel better just by going outside and breathing fresh air. More severe cases may require treatment with pure oxygen or hyperbaric oxygen therapy (HBOT).

What does slow carbon monoxide poisoning look like?

The symptoms of exposure to low levels of carbon monoxide can be like those of food poisoning and flu. Carbon monoxide poisoning doesn't cause a high temperature. The longer you inhale the gas, the worse your symptoms will be. You may lose balance, vision and memory and even consciousness.

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