What are the disadvantages of carbon monoxide detectors?

Author: Tyrell Considine  |  Last update: Thursday, May 28, 2026

Detectors that alarm too early (fail safe) may result in first responder and public risk from unnecessary emergency response actions, whereas detectors that alarm late (fail unsafe) risk CO poisoning to building occupants.

What are the negative effects of carbon monoxide?

Carbon monoxide is harmful because it binds to hemoglobin in the blood, reducing the ability of blood to carry oxygen. This interferes with oxygen delivery to the body's organs. The most common effects of CO exposure are fatigue, headaches, confusion, and dizziness due to inadequate oxygen delivery to the brain.

Where should you not put a carbon monoxide detector?

A carbon monoxide detector should not be placed within fifteen feet of heating or cooking appliances or in or near very humid areas such as bathrooms. For more information about carbon monoxide safety, visit the National Fire Protection Association.

Is it safe to stay in a house with carbon monoxide?

Carbon monoxide is an invisible and odorless gas that comes from any heater that burns fuel. Carbon monoxide buildup can cause illness and death by suffocation.

Is it a good idea to have a carbon monoxide detector in the home?

The Consumer Product Safety Commission recommends a detector on each floor of a residence. At a minimum, a single detector should be placed on each sleeping floor with an additional detector in the area of any major gas burning appliances such as a furnace or water heater.

What Most Homeowners Don’t Know About Carbon Monoxide Detectors

What type of house needs a carbon monoxide detector?

It is strongly recommended for all occupied homes to have carbon monoxide detectors installed. It is especially important for homes with equipment like furnaces, stoves, generators, and gas water heaters to install carbon monoxide detectors to help prevent carbon monoxide poisoning.

What happens if carbon monoxide is detected?

Immediately evacuate the building to fresh air and safety. Call 9-1-1 once safely outside to report the incident and if there is anyone experiencing carbon monoxide poisoning symptoms like headaches, dizziness and vomiting. Do not return into the building until it has been cleared by first responders.

How do I tell if there's carbon monoxide in my house?

It is also a good idea to know the signs of a potential CO problem:
  1. Streaks of soot around fuel-burning appliances, or fallen soot in a fireplace.
  2. Absence of an upward draft in your chimney.
  3. Excess moisture and condensation on windows, walls and cold surfaces.
  4. Rusting on flue pipes or appliance jacks.

Should you open windows if the carbon monoxide alarm goes off?

When you open windows and doors, it helps diminish the amount of carbon monoxide in the air, but the source may still be producing the gas. The levels can build up again once you go back inside and close the windows.

Can carbon monoxide come from AC?

Air Conditioners Do Not Produce Carbon Monoxide. CO gas is a byproduct of incomplete combustion. It is produced when you burn fossil fuels such as natural gas, oil, propane, kerosene, gasoline, charcoal, or wood for heating or cooking purposes.

Is it OK to not have a carbon monoxide detector?

The U.S. Consumer Product Safety Commission (CPSC) recommends that every home should have a carbon monoxide (CO) alarm.

What does carbon monoxide smell like?

Carbon monoxide gas is colourless and does not smell, so you cannot tell if it is around you.

Does CO2 rise or fall in a room?

CO2 levels rise and fall regularly indoors. There are many factors that affect CO2 levels including ventilation, amount of people, and length of time in an enclosed space.

Where to put a carbon monoxide detector?

Where should you place a carbon monoxide detector?
  1. Outside of each bedroom or sleeping area.
  2. Inside an attached garage.
  3. On every floor, including the basement.
  4. At least 10 feet from the garage door leading to your home. ...
  5. At least 15 feet away from gas-burning appliances, like fireplaces or stoves.

What is the main source of carbon monoxide?

The greatest sources of CO to outdoor air are cars, trucks and other vehicles or machinery that burn fossil fuels. A variety of items in your home such as unvented kerosene and gas space heaters, leaking chimneys and furnaces, and gas stoves also release CO and can affect air quality indoors.

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).

What happens if you unplug a carbon monoxide alarm?

Do not unplug your alarm! A First Alert plug-in carbon monoxide alarm will only reset when it is receiving electricity.

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.

Does a closed door stop carbon monoxide?

In case of a fire in your home, a closed door can isolate the fire's flow, reduce room temperature, minimize exposure to the harmful chemicals in smoke, and keep carbon monoxide levels down.

How long does it take for carbon monoxide poisoning to happen?

The longer you inhale the gas, the worse your symptoms will be. You may lose balance, vision and memory and even consciousness. This can happen within 2 hours if there's a lot of carbon monoxide in the air. The smaller an animal or person is, the faster they'll be affected.

How to tell if CO2 is leaking?

A very good tool for leak detection is the use of leak detector spray, available in any well-stocked hardware store. The spray consists of a very fine foam, which is applied to possible leaky spots. If a notable amount of bubbles forms, you have found the leak.

Do all homes have carbon monoxide?

In 2011, most states across the nation adopted new building codes that made it the law that carbon monoxide detectors are required for all one- and two-story family homes. Today, 48 U.S. states have passed legislation requiring carbon monoxide detectors in homes. Check your state's carbon monoxide legislation here.

How can a person know if carbon monoxide is in their house?

Stale, stuffy, or smelly air, like the smell of something burning or overheating. Soot, smoke, fumes, or back-draft in the house from a chimney, fireplace, or other fuel burning equipment. The lack of an upward draft in chimney flue. Fallen soot in fireplaces.

How to remove carbon monoxide detector from wall?

Remove the alarm from the wall or ceiling - Most alarms are attached to a mounting plate and can be removed by turning the alarm counterclockwise. Reference your user's manual - Once the model number and correct battery type have been identified, install the battery using the directions found in the user's manual.

What can trigger a carbon monoxide alarm?

In domestic properties, your CO alarm can be triggered by any fuel burning appliance such as gas cookers, boilers and ovens. All of these appliances give off small traces of CO, but the levels can rise slightly when adequate ventilation isn't provided, or the venting is blocked or clogged by dust.

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