What Does a 95% AFUE Furnace Conversion Involve?
Best Furnace Repair Toronto is a TSSA G1 and G2 licensed furnace company serving Toronto and the GTA since 2005, and converting mid-efficiency furnaces to 95% AFUE condensing units is a core part of that work.
A high-efficiency furnace conversion in Toronto means replacing a mid-efficiency 80% AFUE gas furnace with a 95%+ AFUE condensing unit. The conversion cuts natural gas use for heating by 15 to 20 percent. The new unit uses a secondary heat exchanger to pull additional heat out of the flue gas. It suits the detached homes, semis, and Victorian row houses common in The Annex, Leaside, and the Danforth, as well as 1960s bungalows in Etobicoke and Scarborough.
Our conversion process includes several mandatory upgrades to ensure everything runs perfectly:
- Proper Sizing: Performing a Manual J load calculation to prevent short cycling.
- Venting Upgrades: Installing the required System 636 PVC or polypropylene venting.
- Drainage Setup: Fitting a condensate drain with an acidic neutraliser.
- Official Approval: Securing a municipal permit and commissioning by a TSSA G1 or G2 licensed technician.
Installed cost for a 95% AFUE conversion with a brand like Trane, Lennox, Carrier, or Napoleon runs $5,500 to $8,500 CAD in the Greater Toronto Area in 2026, before rebates. Our ENERGY STAR certified installers in Toronto file the rebate paperwork on your behalf to help offset that initial price.
The 3 Ontario Rebates Available on a 95% AFUE Install
Rebate programs change often, so we check the current Enbridge and federal rules before every quote. We apply for the active programs on your behalf, so the rebate offset is confirmed before you commit.
3 Active Funding Options
- Enbridge Home Efficiency Rebate Plus (HER+). Up to $6,500 CAD when you combine your 95% AFUE furnace upgrade with qualifying envelope improvements like insulation.
- Canada Greener Homes Grant. Up to $5,000 CAD for eligible homeowners upgrading to a high-efficiency system.
- Seasonal manufacturer and utility promotions. Brands like Lennox or Trane frequently run limited-time discounts throughout the year. We flag these specific brand promotions when they apply rather than building them into a quote that might expire.
Program rules, funding levels, and assessment requirements change frequently. We confirm your eligibility in writing before you commit to any project.
The application paperwork requires careful attention to detail. We file all the equipment documentation directly on your behalf.
How Much Does a High-Efficiency Furnace Save in a Toronto Home?
Natural gas delivery and carbon charges have pushed Ontario heating bills up, which makes furnace efficiency worth measuring. We show homeowners the projected saving in CAD against their actual consumption.
The real financial saving comes directly from the efficiency gap between the unit you currently have and the one you install. The table below shows the average natural gas reduction by current unit type.
| Current unit | Efficiency | Approximate heating gas reduction with 95% AFUE |
|---|---|---|
| Pre-1990 gravity or atmospheric | 55 to 70% AFUE | 25 to 35 percent |
| 1990s to 2000s mid-efficiency | 78 to 82% AFUE | 15 to 20 percent |
| Early condensing unit | 90 to 92% AFUE | 3 to 5 percent |
The last row is the honest part of that table because upgrading an existing 90%+ unit simply does not pay off. We always advise clients in that situation to spend their money on different upgrades instead.
Upgrading your attic insulation to the current Ontario Building Code target of R-60 provides a much faster return on investment. We also recommend duct sealing or a cold-climate heat pump for shoulder-season heating where they fit the house.
What Changes in Your Mechanical Room After Conversion
Swapping to a condensing furnace changes four things in your mechanical room. We walk through each one before installation day. The modifications keep the system safe and compliant with the Ontario B149 fuel code and Ontario Building Code.
Key Installation Updates
- Venting: The masonry chimney or B-vent is abandoned for heating purposes and replaced with a sidewall-terminated PVC or polypropylene intake and exhaust pair. We ensure the new vents meet all clearance requirements from windows, doors, meters, and grade.
- Condensate: A condensing furnace produces acidic wastewater that requires proper drainage. We install a neutraliser to treat this liquid before it reaches a floor drain, or add a condensate pump where no gravity drain exists.
- Chimney: The masonry liner will likely need resizing if your water heater still vents into the old chimney to prevent dangerous drafting issues. We check this critical detail during the initial assessment rather than discovering it after the fact.
- Comfort: Most new condensing units feature variable-speed ECM blowers that use up to 75 percent less electricity than older standard motors. We pair these blowers with two-stage or modulating heating, creating longer, gentler cycles that eliminate cold spots.
Homeowners in North York and Scarborough often notice the even temperature distribution before they notice the lower gas bill.
Is a Dual-Fuel Heat Pump Hybrid the Better Fit?
A gas furnace alone is not always the best fit. We install hybrid setups for homeowners who want year-round climate control.
A hybrid suits you if you want efficient cooling in summer alongside reliable winter heating. Our technicians pair a cold-climate air-source heat pump with your gas backup to create a highly efficient dual-fuel system.
The Benefits of a Dual-Fuel Setup
- Smart Switching: The configuration changes the heat source automatically at a set balance point.
- Cost Optimization: Heat pumps operate at up to 300 percent efficiency during milder weather to keep utility costs down.
- Year-Round Comfort: You get reliable air conditioning all summer and powerful gas heating all winter.
This specific dual-fuel option is covered in detail on our page about heat pump repair and cold-climate heating. Some homes only need a straight like-for-like swap without the high-efficiency upgrade. You can review the details for that specific project under furnace replacement Toronto.
Our full set of published CAD scope bands is on the furnace repair Toronto homepage.
Every house has different heating needs based on its layout and existing ductwork. Searching for a high efficiency furnace installer near you? Our TSSA G1 and G2 technicians dispatch across Toronto, North York, Scarborough, Etobicoke, and Thornhill.
Call (647) 360-9992 or send a message to book a home energy assessment and confirm your 2026 rebates.
