Carbon Monoxide Safety for Vancouver Homeowners — HVAC Guide

Published: July 12, 2026 — CANRO Heating & Cooling — Greater Vancouver, BC

What Is Carbon Monoxide and Why Is It Dangerous

Carbon monoxide is a colourless, odourless, and tasteless gas produced when fuels such as natural gas, propane, oil, or wood burn incompletely. It is dangerous because it binds to hemoglobin in your blood more readily than oxygen, reducing your body's ability to transport oxygen to vital organs. CO poisoning symptoms include headache, dizziness, nausea, confusion, weakness, and loss of consciousness. At low levels over time, symptoms may be mistaken for the flu. At high levels, CO can be fatal within minutes.

CO Detectors Are Required Equipment

The City of Vancouver and most BC municipalities require carbon monoxide detectors in homes with fuel-burning appliances or attached garages. Install a CO detector on every level of your home and outside each sleeping area. Detectors should be mounted according to manufacturer instructions — typically on the wall or ceiling. Test detectors monthly by pressing the test button. Replace batteries annually. Replace the detector unit every 5-7 years as sensors degrade over time. Hardwired detectors with battery backup provide the most reliable protection.

HVAC Sources of Carbon Monoxide

Your furnace, boiler, and gas water heater are potential sources of CO if they are not properly maintained or ventilated. A cracked heat exchanger can allow combustion gases to mix with the air circulating through your home. A blocked chimney or flue can cause combustion gases to spill back into the mechanical room. An improperly adjusted burner produces incomplete combustion and elevated CO. A garage with poor ventilation can allow vehicle or small engine exhaust to enter living spaces. A backdrafting appliance can pull combustion gases into the home instead of venting them outside.

Preventing CO Problems Through Maintenance

Annual professional inspection of all fuel-burning appliances is the most effective protection against CO. A technician checks the heat exchanger for cracks, verifies proper burner combustion, inspects the venting and chimney for blockages and integrity, tests safety controls and limit switches, and measures draft to ensure proper venting. Do not block or seal combustion air openings. Keep the area around your furnace and water heater clear of stored items that could restrict airflow. Never use a gas range or oven as a heating source.

What to Do If Your CO Alarm Sounds

If your CO alarm sounds, evacuate everyone from the home immediately. Do not stop to open windows. Call 911 from outside the building. Do not re-enter until emergency services have confirmed the air is safe. Report if anyone is experiencing CO poisoning symptoms. Do not silence the alarm and assume it is a false alarm — treat every alarm as a real emergency. After the emergency is resolved, have a licensed HVAC technician inspect all fuel-burning appliances before restarting them.

Safety Reminder

If you smell gas, suspect carbon monoxide or believe there is an immediate danger, leave the property and contact emergency services or the appropriate gas emergency authority. Do not remain inside — exit the building immediately and call for help from outside.