Ontario Furnace Repair Prices by Repair Type (2026)

Call a TSSA-licensed gas fitter or a company with TSSA G1/G2 certified technicians. Gas furnace work in Ontario is regulated by the Technical Standards and Safety Authority (TSSA) — unlicensed repairs are illegal and void home insurance. Ask any company for their TSSA contractor registration number before booking. (Serving Milton, Ontario.)

Who to call for furnace repair in Ontario?

Call a TSSA-licensed gas fitter or a company with TSSA G1/G2 certified technicians. Gas furnace work in Ontario is regulated by the Technical Standards and Safety Authority (TSSA) — unlicensed repairs are illegal and void home insurance. Ask any company for their TSSA contractor registration number before booking. (Serving Milton, Ontario.)

Furnace repair vs replacement: when to replace?

Use the 5,000 rule: multiply the furnace age (years) by the repair cost. If the result exceeds $5,000, replacement is likely the better financial decision. A 20-year-old furnace with a $350 ignitor repair = 7,000 — lean toward replacement. A 10-year-old furnace with a $300 repair = 3,000 — repair makes sense. (Serving Milton, Ontario.)

Furnace maintenance cost Ontario 2026

Annual furnace maintenance (tune-up) costs $120–$250 in Ontario and includes: inspecting the heat exchanger, cleaning the burners and flame sensor, testing safety controls, lubricating motor bearings, and checking the flue. Maintenance prevents most emergency repairs and is required by most manufacturer warranties. (Serving Milton, Ontario.)

Furnace Repair Cost Ontario 2026 — $300 to $1,200 | Milton

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