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Why You Should Service Your Furnace Before Ontario Winter Hits

Annual furnace maintenance before heating season prevents breakdowns, reduces bills, and keeps your family safe.

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Ontario winters are hard on heating systems. A furnace that runs without issue all year can fail under the increased load of -20°C weather — and emergency HVAC calls during a cold snap can cost 3-4x normal rates.

Annual furnace tune-up includes: cleaning burners, testing the heat exchanger, checking gas pressure, lubricating motor bearings, inspecting the flue, testing safety controls, and replacing the filter. A typical service call is $120-180.

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The heat exchanger is the critical safety check. A cracked heat exchanger can allow carbon monoxide to enter your home — carbon monoxide poisoning is odourless, colourless, and potentially fatal. Annual inspection is essential.

Filter maintenance is the single most important ongoing task. A clogged filter restricts airflow, makes the furnace work harder, and shortens equipment life. Standard 1-inch filters should be replaced every 30-60 days during heating season; thicker media filters every 3-6 months.

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Schedule your service call in September or October, before the seasonal rush. HVAC companies are booked 2-3 weeks out by November. Early service means you get a convenient appointment, and any parts needed are more readily available.

If your furnace is 15+ years old, discuss the cost-benefit of repair vs. replacement with your technician. New high-efficiency furnaces (96%+ AFUE) can significantly reduce heating bills in Ontario's long winters.

Beyond the furnace: have a working carbon monoxide detector on every level of your home and test it seasonally. Replace batteries annually. CO detectors have a 5-7 year lifespan — check the manufacture date.

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