Markham houses from the 1980s and 1990s are mostly on their second furnace, and the 2000s originals are wearing out. Call any hour: we diagnose it, quote one price and fix it when you agree.
Typical ranges, not quotes, plus HST. We agree your price before the repair starts.
📞 Call (647) 677-003734% of Markham homes went up between 1981 and 2000, and 27% between 2001 and 2010. Those two groups explain most of our Markham furnace calls:
| House built | The furnace now | What we test first |
|---|---|---|
| 1981 to 2000 | Usually a replacement from the 2000s | Igniter, flame sensor, inducer and control board |
| 2001 to 2010 | Often the builder original, 15 to 25 years old | Heat exchanger, blower motor and capacitor |
| 2011 to 2021 | High-efficiency, maybe under warranty | Condensate trap, pressure switch and venting |
Source: Statistics Canada, 2021 Census Profile: Markham, checked October 27, 2026.
With 6,075 duplex apartments in Markham, mostly basement suites, plenty of furnaces heat two households. If the suite has its own thermostat on the main furnace, a cold suite may be a damper, a control or a blocked return rather than a furnace fault. Tell us how the house is set up, and whether we need the tenant's permission to get in.
Source: Statistics Canada, 2021 Census Profile: Markham, checked October 27, 2026.
56% of Markham homes are single-detached, many with two storeys over a finished basement. A furnace heating three levels runs long cycles, and the parts that suffer are predictable:
Source: Statistics Canada, 2021 Census Profile: Markham, checked October 27, 2026.
Leave the house with everyone in it. Then call Enbridge Gas at 1-866-763-5427 for a gas odour, or 911 if a carbon monoxide alarm went off. Once it is safe, we find out why. Do not reset a furnace that keeps tripping its rollout switch.
| Repair work | Typical cost |
|---|---|
| Furnace repair, typical | $350 to $950 |
| Hybrid system repair | $400 to $1,200 |
| Yearly furnace tune-up | $120 to $200 |
| GT rental furnace repair | $0, covered |
Before HST, the same as in Brampton. You approve the exact figure before any work.
When a furnace past 15 years is facing a new heat exchanger or control board, or has broken down twice this winter, compare it with a new one. A Midea MGV96 costs $3,222 installed and a Lennox ML196 $3,555; renting starts at $43.99 a month. See furnace installation.
The City of Markham rates its water as hard, at about 123 mg/L. A furnace humidifier passes that water over a pad all winter, so pads scale up and solenoid valves stick. Change the pad every year, and call us if the humidifier leaks or stops.
Source: City of Markham, Tap Water Quality and Testing, checked October 27, 2026.
For cooling, water heaters or a new furnace, go to the Markham HVAC page.