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HVAC Repair in London, ON
Find a verified hvac repair contractor in London. Average cost: $150–$500.
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Last updated: April 2026
Quick Answer
HVAC repair in London Ontario starts at $85 to $150 for diagnostic calls, with common furnace repairs at $200 to $600 and AC repairs at $300 to $900. London's Zone 5A climate with 4,200 heating degree days and humid summers pushes systems hard for eight to nine months annually. Schedule furnace maintenance in September and AC service in April.
Data: GetAHomePro market estimates (Q1 2026), regional market analysis.
HVAC Repair in London: What You Need to Know
HVAC repair in London operates under conditions that push systems to their limits. The city's Zone 5A continental climate delivers 4,200 heating degree days in winter and humid summers regularly exceeding 30 degrees with humidex values in the low 40s. This dual-season demand means London HVAC systems run hard for eight to nine months annually.
London's established neighbourhoods — Old North, Byron, Westmount, and Masonville — contain a wide range of HVAC equipment ages. Heritage homes in Old North and Wortley Village with original gravity-fed ductwork present efficiency challenges that modern furnaces cannot overcome without duct modification. The transition from mid-efficiency to high-efficiency furnaces across London's 1970s and 1980s housing stock created hybrid installations where new equipment connects to undersized original ductwork.
Western University's campus and London Health Sciences Centre are surrounded by residential areas where HVAC contractors maintain dense service relationships. The growth corridors of Stoney Creek and Sunningdale feature newer construction with builder-grade equipment that often requires its first repairs at the 5 to 8 year mark as warranties expire.
HVAC Repair Cost Breakdown — London, ON (2026)
Average prices in CAD based on 10 local contractors — estimated for this market.
| Service Type | Average Cost (CAD) | Typical Duration |
|---|---|---|
| Inspection or tune-up | $75–$120 | 1–2 hours |
| Repair (parts + labor) | $150–$325 | 2–4 hours |
| Unit replacement | $325–$500 | 1–2 days |
| Full system install (furnace + AC) | $500–$1,000 | 2–4 days |
Prices for London, ON. Last updated 2026. Source: GetAHomePro market estimates.
What HVAC Repair Costs in London
Moderate SeasonAverage price range in CAD for the London CMA area, 2026.
Budget$150
Average$325
Premium$500
Most London homeowners pay
$150 – $500
Source: HomeGuide 2025. Prices reflect the London CMA metro area. Last updated 2026.
Estimate
Costs last verified: 2026Sources: GetAHomePro market estimates, regional market analysis, TSSA, (2026)
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Maxcare Heating And Cooling
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★5.0(265)
1994 Clayridge Wy, London, ON N6G 0V2, Canada
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Virtue Heating and Air Conditioning
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HVAC Repair in London — FAQs
Common questions London homeowners ask about hvac repair.
How much does an HVAC service call cost in London Ontario?
Diagnostic HVAC service calls in London typically cost $85 to $150. Common furnace repairs range from $200 to $600, while AC repairs run $300 to $900. After-hours and weekend calls carry a 25 to 50 percent premium, especially during extreme weather events.
How often should London homeowners service their HVAC systems?
Annual service is recommended for both heating and cooling given London's demanding Zone 5A climate. Schedule furnace maintenance in September and AC maintenance in April. Systems older than 10 years benefit from bi-annual inspection to catch developing issues early.
Why is my London home furnace short-cycling?
Short-cycling commonly results from dirty flame sensors, failing ignitors, oversized equipment relative to ductwork capacity, or blocked vents especially after heavy snowfall buries exterior pipes.
Community Questions
Real questions from London homeowners about hvac repair.
My furnace is blowing cold air in this January snap, but the pilot light is on—what's a fair price to get a technician out to a house in Byron?
For a standard service call in the London area, you should expect to pay between $150 and $500 CAD plus 13% HST, depending on whether it’s just a faulty flame sensor or a deeper ignition issue. Since we're dealing with extreme Ontario winter temperatures, ensure the technician you call is TSSA-certified to work on gas equipment, as this is a legal safety requirement in the province.
Do I need to hire a licensed pro for an AC capacitor replacement in my White Oaks home, or is this a simple weekend DIY project?
While it might look simple, electrical work on HVAC units in Ontario must comply with the Ontario Electrical Safety Code, and DIY repairs on high-voltage capacitors carry a serious risk of electric shock. It is safer to pay a professional the typical $200–$400 CAD diagnostic and repair fee, especially since a certified technician can verify there isn't an underlying motor issue causing the capacitor to fail.
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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
What Affects HVAC Repair Costs in London
HVAC repair costs in London reflect climate demand and system age. Diagnostic service calls run $85 to $150. Common furnace repairs — ignitor replacement, blower motor, flame sensor — range from $200 to $600. AC compressor or condenser fan repairs run $300 to $900. Heritage homes with original ductwork in Old North and Wortley Village often require duct sealing alongside equipment repair adding $500 to $2,000. Weekend and after-hours rates carry a 25 to 50 percent premium.
Seasonal Tips for London Homeowners
Schedule furnace inspection in September before London's heating season — contractors offer pre-season pricing and same-week availability. AC maintenance is best booked in April before summer demand fills schedules with two to three week waits by June. London's shoulder seasons in October and April offer the best contractor availability and pricing for non-urgent repairs.
Expert Tip
London homeowners with furnaces installed between 2005 and 2015 should check whether their secondary heat exchanger has been inspected for cracks. This generation experienced higher-than-expected failure rates across several major brands. A cracked heat exchanger can leak carbon monoxide — request a combustion analysis during your annual inspection, not just a visual check.
London's HVAC market is mature and competitive with both large multi-technician firms and smaller specialized shops. The dual-season climate demand creates year-round work supporting a deep bench of experienced technicians. Contractors serving heritage homes in Old North tend to specialize in retrofit solutions while north-end firms focus on modern system diagnostics.
HVAC Repair Demand by Month
Typical demand patterns for hvac repair in London, ON
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Current month
High demand
Low demand
Peak demand months for hvac repair in London: June–August and December–February. Book during March–May and September–November for potential savings of 10–20%.
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HVAC Repair Market in London
With 422,324 residents, London is a mid-size market for hvac repair services.
There are approximately 10 licensed hvac 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.
HVAC Repair Video Guide
Watch this helpful video about hvac repair before hiring a contractor in London.
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Cost estimates based on regional market analysis and industry benchmarks. Contractor ratings from Google Business Profile. Licensing information from Ontario state licensing board. Last updated: March 5, 2026.