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Furnace Repair in London, ON
Furnace Repair in London costs $130–$500 on average (2026). Serving 422,324 residents in homes built around 1975, with 0.62% homeownership.
Quick Answer
Furnace repair in London Ontario costs $85 to $150 for diagnostics with common repairs from $150 to $800. London's 4,200 heating degree days and winter cold to minus 15 make furnace reliability critical November through March. Schedule annual maintenance in September. Clear snow from exterior intake and exhaust vents after storms to prevent the most common lockout cause.
Data: GetAHomePro contractor quotes (Q1 2026), Bureau of Labor Statistics regional wage data.
Furnace Repair in London: What You Need to Know
Furnace repair in London is high-stakes given the city's 4,200 heating degree days and sustained winter cold. When a furnace fails in January with overnight lows hitting minus 15 to minus 20, London homeowners face a genuine safety situation — pipes can begin freezing within hours in an unheated home. The city's continental climate lacks moderating lake effects, making London one of the colder mid-size cities in southwestern Ontario.
London's furnace fleet spans multiple generations. Heritage homes in Old North, Wortley Village, and Old South may still operate mid-efficiency furnaces from the 1990s connected to gravity-fed ductwork. Byron and Westmount's 1970s and 1980s housing stock is often on its second or third furnace. North-end corridors of Masonville, Stoney Creek, and Sunningdale feature high-efficiency condensing furnaces with their own repair patterns: condensate drain blockages, secondary heat exchanger issues, and electronic control board failures.
The Western University and Fanshawe College rental market creates predictable furnace repair volume. Landlords managing student housing must maintain heating systems that meet Ontario residential tenancy standards. Furnace failures in rental properties carry legal urgency — landlords face enforcement action if heat is not restored within reasonable timelines during heating season.
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What Furnace Repair Costs in London
Moderate SeasonAverage price range in CAD for the London CMA area, 2026.
Budget$130
Average$315
Premium$500
Most London homeowners pay
$130 – $500
Source: HomeGuide 2025. Prices reflect the London CMA metro area. Last updated 2026.
Estimate
Costs last verified: 2026Sources: GetAHomePro contractor network, Bureau of Labor Statistics regional wage data, municipal permit records (2026)
Furnace Repair Demand by Month
Typical demand patterns for furnace repair in London, ON
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Peak demand months for furnace repair in London: June–August and December–February. Book during March–May and September–November for potential savings of 10–20%.
How It Works
1
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AC repair, furnace issue, or new installation — describe what you need
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3
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Furnace Repair Video Guide
Watch this helpful video about furnace repair before hiring a contractor in London.
Top Furnace Repair Contractors in London
Verified ratings from Google Business Profile.
Comfort Living Heating & Air Conditioning
★5.0(57)
1853 Blackwater Rd #23, London, ON N5X 4R9, Canada
Reviews for Furnace Repair in London
5.0/ 5
Based on 57 Google reviews across 1 local furnace repair contractors.
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Hvac Licensing in Ontario
Ontario requires licensing for hvac contractors
License type: Refrigeration and AC Mechanic (313A)
Must hold 313A Certificate of Qualification. Apprenticeship + exam. TSSA registration for gas work.
Verify contractor licenseWhy Hiring a Licensed Hvac Contractor Matters in London, ON
When hiring a hvac contractor in London, licensing is your first line of protection. Ontario (ON) requires hvac contractors to hold a valid state license before performing work. This means the contractor has met minimum training, experience, and insurance requirements set by the state. In the London area, always ask for the license number upfront — licensed pros carry liability insurance that covers property damage and injuries on the job, they must follow current building codes, and you have legal recourse through the Ontario licensing board if work is substandard.
Ask for EPA 608 certification (this is a federal requirement, not optional) and whether they are NATE-certified. Check if they perform a Manual J load calculation before recommending system size — contractors who skip this step often sell oversized systems.
Verify Ontario hvac contractor licenses onlineHvac Contractor Certifications to Look For in London
- EPA Section 608 certification (required by federal law for handling refrigerants)
- NATE (North American Technician Excellence) certification for system-specific expertise
- State HVAC contractor license or mechanical contractor license
- R-410A safety certification for modern refrigerant systems
Insurance Requirements for London Hvac Contractors
HVAC contractors should carry general liability insurance ($1,000,000 recommended), workers’ compensation, and completed operations coverage. Refrigerant handling and high-voltage electrical work present unique liability risks.
Risks of Unlicensed Hvac Contractors in Ontario
Unlicensed HVAC work commonly results in improperly sized systems that waste energy and fail prematurely. Incorrect refrigerant charging voids manufacturer warranties. Venting errors for gas furnaces can cause carbon monoxide leaks, which are a leading cause of accidental poisoning deaths in homes.
What Can Go Wrong With Unqualified Hvac Contractors in London
An improperly installed AC system loses 15-25% efficiency, costing hundreds of dollars per year in wasted energy. Incorrect ductwork sizing creates hot/cold spots and excessive noise. Improper gas furnace installation is a fire and carbon monoxide hazard. Refrigerant leaks from unlicensed work harm the environment and carry EPA fines up to $44,539 per day.
What to Verify Before Hiring a Hvac Contractor in London
- Insurance & bonding: Request a certificate of insurance (COI) showing general liability coverage of at least $500,000. HVAC contractors should carry general liability insurance ($1,000,000 recommended), workers’ compensation, and completed operations coverage. A surety bond adds another layer of financial protection if the contractor fails to complete the job.
- References & reviews: Ask for 3 recent references from furnace repair jobs similar to yours in the London area. Cross-check with online reviews — look for consistent patterns, not just the star rating.
- Written contract & warranty: Get everything in writing — scope of work, timeline, payment schedule, and warranty terms. Never pay more than 10-15% upfront for a deposit. A reputable hvac contractor in London will not pressure you for large upfront payments.
What Affects Furnace Repair Costs in London
Furnace repair in London starts with diagnostic calls at $85 to $150. Common repairs include ignitor replacement at $150 to $350, blower motor repair at $300 to $700, flame sensor replacement at $100 to $250, and draft inducer motor at $350 to $650. Circuit board replacement runs $400 to $800. Emergency after-hours calls during cold snaps carry 30 to 50 percent premiums. Heritage homes with original ductwork may need sealing alongside repair adding $500 to $1,500.
Seasonal Tips for London Homeowners
Schedule furnace maintenance in September when London HVAC contractors offer pre-season rates and same-week availability. By November, heating demand fills schedules. Emergency furnace repairs in January and February face the longest waits and highest premiums. If your furnace shows declining performance in October or November, address it immediately rather than risking mid-winter failure.
Expert Tip
London homeowners should clear snow from exterior furnace intake and exhaust vents after every significant snowfall. High-efficiency furnaces draw combustion air from outside — when snow blocks the intake pipe, the furnace shuts down on safety lockout. This is the single most common furnace service call in London during heavy snow events and is entirely preventable.
London's furnace repair market is well-developed with contractors ranging from large multi-technician HVAC companies to smaller specialized heating firms. The lengthy heating season and large housing stock sustain a competitive market where annual maintenance contracts are standard. Contractors experienced with heritage home ductwork and high-efficiency condensate systems serve complementary market segments.
Furnace Repair Market in London
With 422,324 residents, London is a mid-size market for furnace repair services.
There are approximately 1 licensed furnace repair professionals serving London’s 422,324 residents.
With a median home build year of 1975, many homes in London are 51+ years old, meaning many HVAC systems may be nearing end of life. For properties of this age, older HVAC systems may lack energy efficiency.
0.62% of London residents are homeowners, with a mix of rental and owner-occupied properties needing furnace repair services.
Summer temperatures average 21.0°C in London, making reliable air conditioning essential.
With 130 freezing days annually, London homeowners should plan accordingly. Heating systems work harder during extended freeze periods, making regular maintenance critical.
Part of the London CMA metropolitan area, London benefits from competitive pricing among furnace repair providers.
London furnace repair costs are 1% above the Ontario state average. Prices are closely aligned with regional norms.
Sources: U.S. Census Bureau (population, homeownership), NOAA (climate data), GetAHomePro contractor database (2026).
Best Time for Furnace Repair in London
Schedule AC maintenance in early spring (March–April) before the summer rush. Furnace inspections are best done in early fall (September–October).
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Read moreFurnace Repair in London — FAQs
Common questions London homeowners ask about furnace repair.
How much does furnace repair cost in London Ontario?
Furnace repair in London starts at $85 to $150 for diagnostics. Common repairs include ignitor replacement at $150 to $350, blower motor repair at $300 to $700, and circuit board replacement at $400 to $800. Emergency after-hours calls carry 30 to 50 percent premiums.
Why did my furnace stop working after a London snowstorm?
High-efficiency furnaces draw combustion air through an exterior intake pipe. When snow or ice blocks this pipe after a storm, the furnace triggers safety lockout. Clear snow from both intake and exhaust pipes on the exterior wall — this is the most common post-storm furnace call in London.
How often should a London furnace be serviced?
Annual furnace maintenance is essential given London's 4,200 heating degree days. Schedule service in September before heating season. Systems older than 15 years benefit from bi-annual inspection to catch heat exchanger cracks, failing ignitors, and condensate issues before mid-winter failures.
People Also Ask
Related questions about furnace repair in London.
Do I need a licensed hvac contractor in London, Ontario?
Yes. Ontario requires hvac contractors to be properly licensed and insured. Contractors must be registered with the Technical Standards and Safety Authority (TSSA). Always verify your contractor carries general liability insurance and Workplace Safety and Insurance Board (WSIB) coverage. You can check credentials through the Ontario government’s contractor verification portal. Hiring unlicensed contractors can void your home insurance and leave you liable for workplace injuries.
How much does furnace repair cost in London compared to other Ontario cities?
Furnace Repair costs in London vary based on local cost of living, contractor availability, and project scope. GTA cities like Toronto and Mississauga tend to be 10-20% higher than smaller Ontario cities. Northern Ontario cities may have higher travel surcharges. GetAHomePro tracks real pricing data across 92 Ontario cities so you can compare costs before hiring. All prices shown are in Canadian dollars (CAD) and include HST estimates.
How does Ontario weather affect furnace repair scheduling?
Ontario’s climate significantly impacts furnace repair timing. Winters (December–March) with temperatures dropping to -20°C or below can delay outdoor work and increase emergency service demand. Spring thaw (March–April) often reveals winter damage. Summer (June–August) is peak season with longer wait times. Fall is ideal for preventive maintenance before winter. Plan seasonal furnace repair work 3-4 weeks ahead for best availability and pricing.
What permits do I need for furnace repair in London?
Permit requirements in London depend on project scope. Minor repairs rarely need permits, but major furnace repair work—especially involving structural changes, electrical, plumbing, or gas systems—typically requires a building permit from London’s municipal building department. Your contractor should handle the permit application. Ontario Building Code compliance is mandatory. Unpermitted work can create serious problems when selling your home and may not be covered by insurance.
How do I verify an Ontario hvac contractor’s credentials?
To verify a hvac contractor in Ontario: (1) Ask for their license/registration number and check it against the relevant provincial authority (TSSA). (2) Confirm WSIB coverage—request their clearance certificate. (3) Verify general liability insurance (minimum $2M recommended). (4) Check Google reviews and ask for 3 recent local references. (5) Get at least 3 written quotes in CAD with detailed scope of work. GetAHomePro pre-screens contractors across all 92 Ontario cities we serve.
Trending Questions
Popular searches about furnace repair in London.
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For furnace repair in London, we recommend comparing quotes from multiple licensed contractors to find the best fit for your project. Check reviews, verify credentials, and get detailed written estimates before hiring.
can an old furnace be repaired?
For furnace repair in London, we recommend comparing quotes from multiple licensed contractors to find the best fit for your project. Check reviews, verify credentials, and get detailed written estimates before hiring.
how many hours to install a furnace?
For furnace repair in London, we recommend comparing quotes from multiple licensed contractors to find the best fit for your project. Check reviews, verify credentials, and get detailed written estimates before hiring.
Community Questions
Real questions from London homeowners about furnace repair.
My furnace is blowing cold air in this London deep freeze; what’s a realistic budget to set aside for a service call?
For a standard diagnostic and minor repair in London, you can expect to pay between $130 and $500 CAD plus 13% HST. This range typically covers the initial service call fee and basic labor, though prices may spike if your technician needs to source specific parts to handle the stress of our harsh Southwestern Ontario winters.
Is it legal for me to try and fix my own gas furnace igniter, or does Ontario law require a licensed professional?
Under Ontario’s TSSA regulations, any work involving the fuel system or internal gas components must be performed by a technician holding a valid G2 or G3 license. Attempting these repairs yourself is a major safety risk and can void your home insurance policy, so it’s always best to hire a TSSA-certified contractor for anything beyond changing your air filter.
I’ve noticed a strange rattling coming from my furnace unit in my North London home; how quickly should I get someone out here before it gets worse?
You should schedule an inspection immediately, as rattling often indicates a loose blower wheel or failing motor bearing, which can cause total system failure during a cold snap. Most reputable London HVAC companies offer emergency service, but keep in mind that after-hours or weekend visits will likely push your costs toward the upper end of that $130–$500 range.
Does a furnace repair technician in London need any specific certifications beyond just having a business license?
Yes, any contractor working on your furnace must be registered with the Technical Standards and Safety Authority (TSSA) to work on gas-fired appliances in Ontario. You should always ask to see their TSSA certificate, and if they are performing any electrical work on the unit, they must comply with the Electrical Safety Authority (ESA) guidelines to ensure your home remains code-compliant.
We have an older furnace in our Old South home that struggles when the humidity shifts; is it worth paying for a repair or should we just look at a replacement?
If your repair estimate is consistently landing on the high end of the $130–$500 bracket, it may be a sign of systemic age-related failure common in our local climate. I recommend having a technician perform a full evaluation to see if the heat exchanger is still sound, as Ontario's fluctuating winter humidity can accelerate corrosion in older units that are reaching the end of their 15–20 year lifespan.
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Cost data sourced from Bureau of Labor Statistics metro area statistics and industry cost guides. Contractor ratings from Google Business Profile. Licensing information from Ontario state licensing board. Last updated: March 5, 2026.