# Furnace Repair Markham | Best Furnace Repair Toronto

URL: https://bestfurnacerepairtoronto.ca/service-areas/markham/

![](/images/misc/two-furnace-technicians-in-branded-uniforms-carryi.webp)

Serving Markham and surrounding areas

# Furnace Repair Markham: Emergency, Gas Furnace, Replacement and Boiler Service Across York Region

Last updated: September 16, 2026

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.

Call Now: (416) 555-0100

[tel:+14165550100 →](tel:+14165550100)

 

Send a Message

[/contact/ →](/contact/)

## Markham Coverage

-   Same-day dispatch
-   Postal zones: L3P, L3R, L3S, L6B, L6C
-   Unionville, Milliken, Cornell, Markham Village
-   TSSA G1 and G2 licensed technicians only

**20+ Years** GTA Furnace Experience

**5-Star** Customer Satisfaction

**Same-Day** Emergency Response

**TSSA Licensed** G1 and G2 Certified

The Honest Conversation

## 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.

What We Handle in Markham

## 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.

 

![TSSA-licensed technician arriving at a Toronto home at night for an emergency no-heat furnace call](/images/misc/furnace-technician-in-a-branded-winter-jacket-carr.webp) 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.

[Emergency Furnace Repair Toronto →](/emergency-furnace-repair-toronto/)

 

![Technician testing a gas furnace flame sensor with a microamp meter in a Toronto basement](/images/misc/tssa-licensed-technician-testing-a-gas-furnace-fla.webp) 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.

[Gas Furnace Repair and Diagnostic Toronto →](/gas-furnace-repair-toronto/)

 

![Technicians installing a new high-efficiency gas furnace in a Toronto basement](/images/misc/two-technicians-lowering-a-new-high-efficiency-gas.webp) 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 Replacement Toronto →](/furnace-replacement-toronto/)

![Technicians positioning and levelling a new gas furnace during installation in a Toronto basement](/images/misc/technicians-setting-a-new-gas-furnace-onto-a-level.webp)

### Furnace Installation Toronto

Right-sized installs with ECM blower and staging options, venting, and Ontario Building Code compliance.

[Furnace Installation Toronto →](/furnace-installation-toronto/)

![High-efficiency 95% AFUE condensing furnace installed with PVC venting in a Toronto basement](/images/misc/newly-installed-95-percent-afue-condensing-furnace.webp)

### High-Efficiency Furnace Conversion Toronto

95% AFUE conversions with rebate coordination, condensing venting, and 15 to 20 percent gas savings.

[High-Efficiency Furnace Conversion Toronto →](/high-efficiency-furnace-toronto/)

![Technician performing a 12-point furnace tune-up with a combustion analyzer in a Toronto basement](/images/misc/technician-running-a-12-point-furnace-tune-up-with.webp)

### Furnace Tune-Up Toronto

12-point annual inspection with combustion analysis, CO monitor, and thermostat calibration, $149 to $249 CAD.

[Furnace Tune-Up Toronto →](/furnace-tune-up-toronto/)

See All Furnace Services

[/emergency-furnace-repair-toronto/ →](/emergency-furnace-repair-toronto/)

Commonly needed in Markham: 

High-Efficiency Furnace Conversion Toronto

[/high-efficiency-furnace-toronto/ →](/high-efficiency-furnace-toronto/)

 , 

Heat Exchanger Repair Toronto

[/heat-exchanger-repair-toronto/ →](/heat-exchanger-repair-toronto/)

From Call to Verified Repair

## How Our Markham Furnace Diagnostic Process Works

Every furnace call follows the same documented process, from booking through post-repair combustion verification.

01

### Booking and Dispatch

Send your postal code, furnace age, and symptom. Same-day or next-morning slot booked. Diagnostic fee quoted upfront in CAD.

02

### 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.

03

### 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.

04

### 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.

05

### 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.

(416) 555-0100

[tel:+14165550100 →](tel:+14165550100)

 

Send a Message

[/contact/ →](/contact/)

Local Advantage

## Why Markham Homeowners Choose Us

01

### 20+ Years of Furnace Repair Experience across York Region

02

### Same-day dispatch to Unionville, Milliken, Cornell, and Markham Village

03

### Camera heat exchanger inspection on older units before any recommendation

04

### TSSA G1 and G2 licensed technicians on every gas furnace call

05

### 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.

Local Feedback

## 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.”

W Wei L. Unionville

> “Condensate line froze and shut the furnace down. They cleared it, insulated the run properly, and explained how to spot it early next winter.”

J Jonathan F. Cornell

> “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.”

R Rosa G. Markham Village

## Neighbourhoods and Postal Zones We Cover in Markham

Unionville Milliken Cornell Markham Village Berczy Village Box Grove L3P L3R L3S L6B L6C

Near Markville Shopping Centre and Pacific Mall

Markville Shopping Centre Pacific Mall Markham Stouffville Hospital (Oak Valley Health) Toogood Pond

## Our Markham Service Area

Get Directions to the Markham Service Area

[https://www.google.com/maps/dir/?api=1&destination=43.8561,-79.337 →](https://www.google.com/maps/dir/?api=1&destination=43.8561,-79.337)

Local Answers

## Furnace Repair in Markham, Questions Answered

### Do you provide same-day furnace repair in Markham?

Yes. Same-day dispatch covers L3P, L3R, L3S, L6B, and L6C, with cold-snap no-heat calls prioritised over routine bookings.

### Which Markham areas do you serve?

Unionville, Milliken, Cornell, and Markham Village, plus the neighbouring Richmond Hill, Thornhill, and Scarborough coverage areas.

### How do I know if my furnace needs replacing?

Age, heat exchanger condition, and repair cost against efficiency gain decide it. Under 15 years with an intact exchanger usually favours repair; past 20 years the 95% AFUE gap usually favours replacement. You get that comparison in writing.

### 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.

Call Now: (416) 555-0100

[tel:+14165550100 →](tel:+14165550100)

 

Send a Message

[/contact/ →](/contact/)

## Furnace Service Near Markham

Richmond Hill Same-day dispatch

[/service-areas/richmond-hill/ →](/service-areas/richmond-hill/)

 

Thornhill Same-day dispatch

[/service-areas/thornhill/ →](/service-areas/thornhill/)

 

Scarborough Same-day, 4-hour cold-snap window

[/service-areas/scarborough/ →](/service-areas/scarborough/)

![](/images/misc/two-furnace-technicians-in-branded-winter-uniforms.webp)

Same-Day Emergency Dispatch, 24/7 Cold Snap Response

## 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.

Call Now: (416) 555-0100

[tel:+14165550100 →](tel:+14165550100)

 

Send a Message

[/contact/ →](/contact/)

-   Diagnostic waived on same-visit repair
-   TSSA G1 and G2 licensed technicians
-   Published CAD pricing, no quote gating