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CO Alarms
Having certified, working, properly installed and maintained alarms will warn you of rising CO levels, giving you time to take potentially life-saving actions.
Attention Homeowners and Landlords
New carbon monoxide (CO) alarm rules are coming for existing homes — including detached and semi-detached houses, townhomes, and cottages. Find out about the updated safety requirements taking effect January 1, 2026.You must have carbon monoxide alarms if: You have a fireplaceYou have a fuel-burning appliance (like a furnace, water heater, or stove)You have heated air that comes from a fuel-burning appliance not located inside your home
Things to know about CO Alarms
A CO alarm works much like a home smoke alarm and beeps loudly when the sensors detect carbon monoxide. When choosing a CO alarm, look for a certification mark (CSA, ULC or other recognized certification body). This shows that the alarm met recognized standards for safety. CO alarms should be installed as per manufacturer’s instructions. Follow the same manufacturer’s maintenance procedures as you would with smoke alarms.
Where to install CO alarm:
- On every level of your home or cottage
- In your RV and boat cabin
- Near sleeping areas
- In your boathouse
Do not install CO alarms here:
- Windows or vents
- Bathrooms
- Heating or fuel-burning appliances
- Smoke alarms (unless a combination alarm)
Alarm testing
- Remember to test your CO alarm and smoke alarm once a month by pushing the test button on the unit.
- Replace batteries once a year, including back-up batteries for plug-in alarms.
- A good habit is to change the batteries every fall or spring when you change your clocks.
Like most things, CO alarms wear out over time. Check the manufacturer’s instructions to find out when your particular unit should be replaced (usually after 7-10 years for CO alarms and 10 years for smoke alarms).
Alarm Yourself
Test once a month. Change batteries annually. Replace when required.