Tips & Tricks
Holiday Safety Tips for Your Home Heating System
March 28, 2026 · 8 min read
Key Takeaways
- Schedule a furnace inspection before the holiday season to prevent mid-winter breakdowns
- Keep space heaters at least 3 feet from decorations, curtains, and wrapping paper
- Test CO detectors on every level of your home — replace batteries twice yearly
- Never use an oven or gas stove as a supplemental heat source
The holidays bring house guests, decorations, cooking marathons, and higher heating demands — a perfect recipe for home safety hazards if your HVAC system isn't prepared. Here's how to keep your family safe while staying warm through the season.
Get Your Furnace Inspected Before the Rush
The worst time for a furnace breakdown is Christmas Eve with a house full of guests. Schedule a professional tune-up in early November — technicians check the heat exchanger for cracks (carbon monoxide risk), test safety switches, and verify the ignition system. A cracked heat exchanger can leak carbon monoxide into your home with zero visible signs.
If your furnace is over 15 years old, consider a pre-season evaluation. Older units are more likely to develop heat exchanger cracks and efficiency drops that compound during heavy use periods.
Space Heater Safety Rules
Portable space heaters cause an estimated 1,700 house fires per year in Canada. During the holidays — with extra decorations, wrapping paper, and dried-out Christmas trees — the risk increases significantly.
- 3-foot rule: Keep space heaters at least 3 feet from anything combustible — curtains, decorations, gift wrap, stockings, and furniture
- Plug directly into a wall outlet: Never use an extension cord or power strip. Space heaters draw 1,500 watts — enough to melt an undersized cord
- Turn off when leaving the room: No exceptions. Buy a model with an automatic tip-over shutoff switch
- One heater per outlet: Don't share the outlet with holiday lights or other appliances
Carbon Monoxide: The Invisible Holiday Danger
Holiday gatherings mean more cooking, more people (more CO2), and furnaces running at full capacity. Carbon monoxide poisoning symptoms — headache, dizziness, nausea — mimic the flu. Many families dismiss early symptoms as a holiday bug.
Test every CO detector in your home. Ontario law requires CO alarms on every level with a fuel-burning appliance or attached garage. Replace units older than 7 years. If your detector chirps, replace the battery immediately — don't pull the battery and forget about it.
Never use these as heat sources: gas oven, gas stove, barbecue (indoors or in a garage), car engine in a closed garage, or a generator indoors. Every year, emergency rooms treat families who used improvised heating during power outages.
Fireplace and Chimney Safety
If you use a wood-burning fireplace, get the chimney inspected and cleaned before the first fire of the season. Creosote buildup is the leading cause of chimney fires. Keep the damper open until ashes are completely cold. Use a metal mesh screen to prevent embers from reaching the room.
Holiday-specific tip: Never burn wrapping paper, cardboard, or styrofoam in the fireplace. Wrapping paper burns extremely fast and can send flaming fragments up the chimney. Coloured inks can release toxic fumes.
Protect Your Pipes When Travelling
If you're leaving for a holiday trip, don't set the thermostat below 16°C (60°F). Frozen pipes burst and cause thousands of dollars in water damage. Open cabinet doors under kitchen and bathroom sinks to let warm air reach exposed pipes. If you'll be gone more than a week, have a neighbour check on the house.
Holiday Decoration and HVAC Conflicts
- Don't block vents: That Christmas tree in the corner might be covering a floor register. Blocked vents create pressure imbalances and force your furnace to work harder
- Watch the thermostat: With 15 guests and a turkey in the oven, your home heats up fast. A programmable thermostat prevents the furnace from competing with body heat and cooking
- Change the filter: Holiday cooking, guests tracking in dirt, and a dried-out tree shed particles that clog the filter faster than normal. Check it before and after the holiday season
Emergency Preparedness
Keep a flashlight, extra blankets, and a battery-powered radio accessible in case of a winter power outage. Know where your gas shutoff valve is. Keep the HVAC technician's number saved in your phone — 1-855-539-4328 is available 24/7, including holidays.
Frequently Asked Questions
Is it safe to leave holiday lights on overnight with the furnace running?
LED holiday lights produce minimal heat and are generally safe. Older incandescent lights get hot and increase fire risk, especially near curtains or a dry tree. Either way, unplug lights when you go to bed or leave the house — a timer makes this automatic.
How often should I replace CO detector batteries?
Twice a year — when clocks change for daylight saving time is the easiest reminder. Replace the entire unit every 7 years regardless of battery status.
What temperature should I set the thermostat when hosting a holiday party?
Drop it 2–3°C below normal before guests arrive. Fifteen people, cooking, and an open oven add significant heat. You'll save energy and prevent the house from becoming uncomfortably warm.
Stay Safe This Season
A 30-minute safety check before the holidays can prevent a dangerous situation. Book a pre-season inspection or call 1-855-539-4328 — we're here 24/7, even on Christmas Day.