You can’t smell it. You can’t see it. But it could be in your home right now.
Carbon monoxide (CO) is a colourless, odourless gas that can build up silently and harmfully inside your home. Every winter, homeowners across Ontario unknowingly expose themselves to this deadly risk through fuel-burning appliances like furnaces, fireplaces, gas stoves, and water heaters. And as of January 2026, new legislation in Ontario has raised the stakes.
What Changed in 2026?
As of January 1, 2026, Ontario law now requires: Mandatory carbon monoxide detection systems in all residential properties with fuel-burning appliances or attached garages. – Annual safety inspections of combustion appliances and venting systems, especially in multi-unit residential buildings and rentals.
Failure to comply can result in fines and, more importantly, increased risk to the safety of occupants.
This means it’s not just about prevention anymore—it’s now the law.
Why Carbon Monoxide Is So Dangerous
CO is created when fuels like natural gas, wood, oil, or propane don’t burn completely. Without proper ventilation or maintenance, CO can leak and quickly build to unsafe levels.
Even low-level exposure can cause: – Headaches – Dizziness – Nausea – Fatigue
Prolonged or high-level exposure can be fatal.
Children, seniors, and people with pre-existing health conditions are especially vulnerable.
4 Signs Your Home May Be at Risk
- You use a gas or wood-burning appliance regularly.
- Your CO detector is outdated or missing.
- You’ve never had your combustion appliances inspected.
- You notice soot, smells, or strange furnace behaviour.
If any of these apply, it’s time to take action.
Don’t Wait Until It’s Too Late
CO is silent—but the consequences are loud. Protect your family, tenants, or clients with proactive safety steps.
Want peace of mind this winter? Make sure your CO detectors are working and that your home complies with Ontario’s updated laws.
Learn more about carbon monoxide safety on our website.