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How Long Does a Furnace Last in Ontario? — Lifespan & Replacement Guide
A properly maintained gas furnace in Scarborough and Ontario lasts 15–25 years. Here is what affects lifespan and when to consider replacement.
Furnace Lifespan by Component
- Heat exchanger — Should last the life of the furnace; cracks end furnace life immediately
- Blower motor — 15–20 years
- Control board — 10–15 years
- Igniter — 5–10 years (common repair)
When to Replace vs Repair (Ontario 2026)
Replace when: furnace is 18+ years old with a major component failure, repair cost exceeds 40% of replacement cost ($5,000), or heat exchanger is cracked. A 20-year old furnace running at 60% AFUE vs a new 96% AFUE unit: save $400–$600/year in gas.
How long does a furnace last in Ontario?
A properly maintained furnace lasts 15-25 years in Ontario. Annual tune-ups extend life. Replace when: the furnace is 18+ years old with major component failure, the heat exchanger cracks, or repair cost exceeds 40% of a $3,500-$5,500 replacement. Call Madina Mechanical at (416) 424-4328 for a free furnace assessment in Scarborough.
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Free Furnace Assessment Scarborough: (416) 424-4328
