Furnace Repair Markham: Emergency, Gas Furnace, Replacement and Boiler Service Across York Region
Furnace repair in Markham covers the L3P through L6C postal zones, spanning Unionville and Markham Village heritage streets, established Milliken housing, and newer Cornell builds. Best Furnace Repair Toronto provides same-day York Region dispatch with TSSA G1 and G2 licensed technicians, published CAD pricing, and a written repair-vs-replace recommendation on every diagnostic.
Markham Coverage
- Same-day dispatch
- Postal zones: L3P, L3R, L3S, L6B, L6C
- Unionville, Milliken, Cornell, Markham Village
- TSSA G1 and G2 licensed technicians only
What Actually Stops Homeowners From Calling a Furnace Technician
Four hesitations we hear on first calls, and the straight answers behind each one.
“The diagnostic fee feels like a trap.”
Some contractors charge $200 CAD to show up and discount nothing off the repair. Our diagnostic starts at $99 CAD and is waived when you authorise the repair on the same visit. The fee covers a full combustion analysis, CO check, and a written fault report you keep regardless.
“You cannot tell if the technician is really licensed.”
Ontario requires TSSA G1 or G2 certification for any gas furnace work. Ours hold both. Certificate numbers appear on every invoice per B149 fuel code. You can verify any number on the TSSA public registry before the technician starts.
“Nobody will publish the price.”
Our four CAD scope bands are published on this page: diagnostic $99 to $149, standard repair $150 to $950, major repair $600 to $1,500, full replacement $3,500 to $8,500. Scope named, not hidden behind adjectives.
“The furnace is 15 years old, is it worth repairing?”
At 15 years with an intact heat exchanger, 5 to 10 more service years. At 20+, the 95% AFUE efficiency gap justifies replacement. Written repair-vs-replace recommendation on every diagnostic, with the numbers.
Furnace and Heating Services in Markham
Every service below is available across Unionville, Milliken, Cornell and the wider Markham area, handled by TSSA G1 and G2 licensed technicians.
24/7 Dispatch Emergency Furnace Repair Toronto
24/7 same-day dispatch for cold-snap no-heat calls, prioritised within 4 hours across the GTA.
Most Common Gas Furnace Repair and Diagnostic Toronto
Diagnostic from $99 CAD, waived on same-visit repair. Thermocouple, flame sensor, capacitor, gas valve, ignition module.
Rebates Filed Furnace Replacement Toronto
80% AFUE from $3,500 CAD, 95% AFUE from $5,500 CAD. Removal, disposal, and permit included, rebate paperwork filed for you.
Furnace Installation Toronto
Right-sized installs with ECM blower and staging options, venting, and Ontario Building Code compliance.
High-Efficiency Furnace Conversion Toronto
95% AFUE conversions with rebate coordination, condensing venting, and 15 to 20 percent gas savings.
Furnace Tune-Up Toronto
12-point annual inspection with combustion analysis, CO monitor, and thermostat calibration, $149 to $249 CAD.
Commonly needed in Markham: High-Efficiency Furnace Conversion Toronto , Heat Exchanger Repair Toronto
How Our Markham Furnace Diagnostic Process Works
Every furnace call follows the same documented process, from booking through post-repair combustion verification.
Booking and Dispatch
Send your postal code, furnace age, and symptom. Same-day or next-morning slot booked. Diagnostic fee quoted upfront in CAD.
On-Site Inspection
Full furnace assessment: heat exchanger, ignition system, blower motor, flame sensor, gas valve, combustion analysis with CO monitor, flue draft, and thermostat response.
Written Diagnostic with Options
You receive a written report with the fault identified, parts required, CAD labour and parts cost, and either a repair or replacement recommendation.
Repair or Replacement Scheduled
Repair authorised same-visit gets the diagnostic fee waived. Replacement scheduled within 3 to 5 business days, or 24 hours for an emergency no-heat situation.
Post-Service Verification and Warranty
Combustion analysis re-run, CO reading verified, thermostat cycle tested, and the parts and labour warranty issued in writing.
No heat in Markham?
Same-day dispatch. Call and we will tell you the likely fault and the CAD range before a technician is dispatched.
Why Markham Homeowners Choose Us
20+ Years of Furnace Repair Experience across York Region
Same-day dispatch to Unionville, Milliken, Cornell, and Markham Village
Camera heat exchanger inspection on older units before any recommendation
TSSA G1 and G2 licensed technicians on every gas furnace call
Four published CAD scope bands with the diagnostic waived on same-visit repair
Markham Dispatch and Response
Markham routing runs off Highway 404, Highway 407, Highway 7, and Markham Road, giving same-day coverage across Unionville, Milliken, Cornell, and Markham Village.
The first hard freeze of the season produces the heaviest York Region call volume. Cold-snap no-heat calls are triaged ahead of routine maintenance bookings.
Markham Housing Stock and Furnace Age
Milliken and Markham Village hold housing from the 1970s to 1990s where furnaces past 20 years are common. Heat exchanger inspection matters most in that age band, and we use camera inspection plus combustion analysis before recommending repair or replacement.
Cornell and newer Unionville builds run condensing high-efficiency units where the usual faults are condensate drainage, pressure switches, ignition components, and control boards. Those are straightforward same-visit repairs when the part is on the van.
What Markham Customers Say
“Called about a furnace that kept locking out. The flame sensor and ignition repair was done in under 90 minutes with the cost confirmed before any work started.”
“Condensate line froze and shut the furnace down. They cleared it, insulated the run properly, and explained how to spot it early next winter.”
“Twenty-year-old unit, honest advice. They said it had life left with a blower motor replacement and did not push a replacement I did not need.”
Neighbourhoods and Postal Zones We Cover in Markham
Furnace Repair in Markham, Questions Answered
Do you provide same-day furnace repair in Markham?
Which Markham areas do you serve?
How do I know if my furnace needs replacing?
Still have a question about your furnace?
Tell us the symptom, the furnace age, and your postal code. We will tell you what it likely is and what the CAD range looks like before anyone is dispatched.
Furnace Service Near Markham
Book a Furnace Technician in Markham
Same-day dispatch across L3P, L3R, L3S, L6B, L6C. You get the fault in writing, the CAD cost up front, and the diagnostic fee waived when the repair is authorised on the same visit.
- Diagnostic waived on same-visit repair
- TSSA G1 and G2 licensed technicians
- Published CAD pricing, no quote gating