Loading content...
Furnace Installation in London, ON
Furnace Installation in London costs $2,500–$6,500 on average (2026). Serving 422,324 residents in homes built around 1975, with 0.62% homeownership.
Quick Answer
Furnace installation in London Ontario costs $3,500 to $6,500 for standard high-efficiency units and $5,500 to $9,000 for two-stage furnaces. London's 4,200 heating degree days make furnace efficiency critical. Heritage homes in Old North and Wortley Village often require ductwork modification adding $1,000 to $3,000. Install in late August through October for best pricing.
Data: GetAHomePro contractor quotes (Q1 2026), Bureau of Labor Statistics regional wage data.
Furnace Installation in London: What You Need to Know
Furnace installation in London is a significant investment driven by the city's demanding heating season and aging housing stock. With 4,200 heating degree days and a median home build year around 1975, a large portion of London homes are on their second or third furnace. The transition from mid-efficiency to high-efficiency condensing furnaces has been the dominant market shift, with London's natural gas infrastructure making gas-fired heating the clear default.
Heritage homes in Old North, Wortley Village, and Old South present installation challenges beyond equipment swapping. Original gravity-fed ductwork cannot deliver the static pressure modern high-efficiency furnaces require without modification. Venting requirements change dramatically when upgrading from mid-efficiency chimney exhaust to high-efficiency PVC intake and exhaust through an exterior wall.
Byron, Westmount, and Masonville represent London's sweet spot for straightforward replacement — homes from the 1970s through 1990s with existing ductwork that accommodates modern equipment with minimal modification. London's Enbridge gas utility offers rebates for qualifying high-efficiency installations, and the Canada Greener Homes Grant program has been popular among London homeowners given the direct payback in a city where furnaces run heavily for five to six months.
Licensed & Insured
Ontario-verified pros
4.7★ Avg Rating
9200+ vetted pros
1+ Served
Homeowners matched
Quotes in 30 Min
Free, no obligation
Get an Instant Estimate
1 of 3What kind of HVAC work?
Free, No-Obligation Quotes
Get Furnace Installation Quotes
Compare prices from licensed London contractors — takes 30 seconds.
A
B
C
D
E
Trusted by homeowners across Ontario
What Furnace Installation Costs in London
Moderate SeasonAverage price range in CAD for the London CMA area, 2026.
Budget$2,500
Average$4,500
Premium$6,500
Most London homeowners pay
$2,500 – $6,500
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 Installation Demand by Month
Typical demand patterns for furnace installation in London, ON
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Current month
High demand
Low demand
Peak demand months for furnace installation in London: June–August and December–February. Book during March–May and September–November for potential savings of 10–20%.
How It Works
1
Tell Us About Your System
AC repair, furnace issue, or new installation — describe what you need
2
Get HVAC Quotes
Certified HVAC technicians in London compete for your business
3
Schedule Service
Choose the best quote and book your appointment
Furnace Installation Video Guide
Watch this helpful video about furnace installation before hiring a contractor in London.
Top Furnace Installation Contractors in London
Verified ratings from Google Business Profile.
Constant Home Comfort London
★4.6(73)
309 Exeter Rd Building #45, London, ON N6E 0A3, Canada
Reviews for Furnace Installation in London
4.6/ 5
Based on 73 Google reviews across 1 local furnace installation contractors.
Get matched with a top-rated pro — request a free quote!
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 installation 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 Installation Costs in London
Furnace installation in London ranges from $3,500 to $6,500 for standard high-efficiency single-stage units and $5,500 to $9,000 for variable-speed two-stage furnaces. Heritage home installations requiring ductwork modification add $1,000 to $3,000. Removal and disposal of existing equipment costs $200 to $500. City of London HVAC permits run $150 to $300 with mandatory TSSA inspection. Two-stage furnaces deliver 15 to 25 percent energy savings with four to six year payback in London's heating season.
Seasonal Tips for London Homeowners
The optimal window for furnace installation is late August through early October when contractors have post-summer availability and can complete work before heating season peaks. Spring installations in April and May also offer good pricing. Avoid November through February when emergency replacements compete for installer time and pricing reflects peak demand. Plan replacement proactively for furnaces over 18 years old.
Expert Tip
When replacing a furnace in a London home built before 1990, insist the installer performs a heat loss calculation specific to your home rather than matching existing furnace size. Over-sizing was standard practice for decades — a properly sized 80,000 BTU high-efficiency furnace often outperforms an oversized 100,000 BTU unit it replaces with improved efficiency and reduced cycling.
London's furnace installation market is competitive with pricing transparency driven by an educated homeowner base. Major HVAC brands are well-represented with multiple authorized dealers. Contractors offering comprehensive quotes with heat loss calculations, ductwork assessment, and rebate assistance provide the most value. The heritage home market favours experienced installers who understand retrofit challenges.
Furnace Installation Market in London
With 422,324 residents, London is a mid-size market for furnace installation services.
There are approximately 1 licensed furnace installation 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 installation 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 installation providers.
London furnace installation costs are 2% 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 Installation in London
Schedule AC maintenance in early spring (March–April) before the summer rush. Furnace inspections are best done in early fall (September–October).
Cost Guides & Tips
Related articles for furnace installation in London.
ComparisonMar 6, 2026
Electric Furnace vs. Gas Furnace in Ontario: Complete Cost Comparison
Electric vs gas furnace comparison for Ontario. Operating costs with Ontario Hydro rates, Enbridge gas pricing, cold-weather performance,...
Read moreHow-ToMar 6, 2026
Licensed Furnace Installation Requirements in Ontario (2026)
Ontario furnace installation licensing requirements 2026. TSSA G2 gas fitter certification, sheet metal 308A, permit requirements,...
Read moreComparisonMar 5, 2026
Gas Furnace vs. Heat Pump in Ontario: Which Heats Better for Less?
Gas furnace vs heat pump comparison for Ontario climate. Operating costs, efficiency at cold temperatures, rebates, and break-even analysis.
Read moreFurnace Installation in London — FAQs
Common questions London homeowners ask about furnace installation.
How much does a new furnace cost in London Ontario?
Standard high-efficiency single-stage furnace installation in London costs $3,500 to $6,500. Variable-speed two-stage furnaces run $5,500 to $9,000. Heritage home installations requiring ductwork and venting modifications add $1,000 to $3,000. City permits and TSSA inspection add $150 to $300.
What size furnace does a London home need?
Furnace sizing depends on square footage, insulation quality, window area, and ceiling height. A proper heat loss calculation is essential. Typical London homes of 1,500 to 2,000 square feet need 60,000 to 90,000 BTU high-efficiency furnaces. Avoid installers who simply match existing equipment size.
Are there rebates for furnace installation in London?
Enbridge gas utility offers rebates for qualifying high-efficiency furnace installations. Federal programs like the Canada Greener Homes Grant provide additional incentives when active. Your installer should identify all available rebates during the quoting process and assist with applications.
People Also Ask
Related questions about furnace installation 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 installation cost in London compared to other Ontario cities?
Furnace Installation 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 installation scheduling?
Ontario’s climate significantly impacts furnace installation 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 installation work 3-4 weeks ahead for best availability and pricing.
What permits do I need for furnace installation in London?
Permit requirements in London depend on project scope. Minor repairs rarely need permits, but major furnace installation 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 installation in London.
what is an emergency repair?
For furnace installation 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 installation 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 installation 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 installation.
What is the realistic all-in price for a mid-range furnace install in London, considering our brutal winters?
For a standard high-efficiency unit in London, you should budget between $2,500 and $6,500 CAD, depending on the BTU output required for your specific square footage. Keep in mind that this price usually excludes the 13% HST, so ensure your quote breaks down the tax separately. Given our damp, cold Ontario winters, investing slightly more in a two-stage or modulating furnace is often worth the extra upfront cost for better humidity control.
I’m looking to swap out my old natural gas furnace for a new one; do I need to hire a TSSA-certified tech, or can I DIY this in Ontario?
In Ontario, you are legally prohibited from performing a natural gas furnace installation yourself due to strict TSSA (Technical Standards and Safety Authority) regulations. Every installer must hold a valid G2 or G1 gas fitter license to ensure the unit is vented and fired safely according to the Ontario Building Code. Attempting this yourself is not only illegal but will void your home insurance and manufacturer’s warranty immediately.
How long does the actual installation process take? I’m worried about my family freezing during a London January cold snap.
A standard furnace swap-out typically takes between 6 to 10 hours, meaning you will have heat restored by the end of the day. To avoid the peak January rush, try to schedule your installation in the autumn, as local London HVAC crews are often booked solid once the first hard freeze hits. If your furnace has already failed, most reputable local companies prioritize 'no-heat' emergencies and can usually get a crew out within 24 to 48 hours.
Are there any specific Ontario-wide rebates I should ask my London contractor about when replacing a unit?
Currently, while the federal Greener Homes Grant has evolved, you should ask your contractor about the Enbridge Gas 'Home Efficiency Rebate Plus' program if you are replacing your unit as part of a larger energy retrofit. Ensure your installer is OCOT-certified, as many rebate programs require proof of professional installation to qualify for any financial incentives. Always ask the technician to provide a detailed invoice, as you’ll need it to track the equipment’s serial number for the 13% HST tax recovery if applicable.
How do I know if my electrical panel needs an upgrade when switching to a high-efficiency furnace?
High-efficiency furnaces use an ECM motor that is generally more electrical-efficient than older models, so you rarely need a panel upgrade just for the furnace itself. However, if your home’s electrical service is older than 30 years, an ESA (Electrical Safety Authority) inspection may be triggered if the contractor has to modify existing wiring to bring it up to current Ontario safety codes. It’s best to have your installer do a quick assessment of your current breaker during the initial quote to ensure it meets the manufacturer's specific amperage requirements.
People Also Search For
oven repair london near mecar air conditioning repair london near mehvac companies near londonderry nhhvac contractors in londoncheapest furnace repair london ontariofurnace installation london ontariohvac repair london ontariocar ac repair near londonhvac company london ontariohvac installation londonac service in londonac repair london ontario
Ready to Get Started?
Compare quotes from licensed furnace installation pros in London. Free, fast, no obligation.
Get My Free Quotes →Explore More Home Services
Furnace Installation Cost Comparison
Ontario Furnace Installation Resources
More Services in London
Furnace Installation Nearby
Related Searches Nearby
hvac recommendations near meRichmond Hillac repair company near meMississaugafurnace installation ottawaOttawafurnace repair in windsorWindsorfurnace repair in oakvilleOakvillefurnace installation st catharinesSt. Catharineshvac repair richmond hillRichmond Hillfurnace installation mississaugaMississauga
Related Comparisons
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.