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A typical installed natural-gas furnace replacement in Ontario may cost approximately $4,500 to $9,500 CAD before HST in 2026, An installed quote generally includes the furnace, labour, removal of the existing unit and standard installation work, but inclusions vary by contractor.
| Furnace Replacement Level | Price Range | Common Features You May See |
|---|---|---|
| Entry-Level | $4,500 to $6,500 CAD | Typically 95–96% AFUE, single-stage operation, and a standard or constant-torque ECM blower, with straightforward installation |
| Mid-Range | $6,500 to $8,500 CAD | Typically 96–97% AFUE, two-stage operation, and an enhanced ECM or variable-speed ECM blower, depending on the model |
| Premium | $8,500 to $9,500+ CAD | Higher AFUE options, modulating gas valve, advanced variable-speed blower/control system; complex installations can reach about $12,000+ CAD |
Note – These are examples of common feature combinations, not fixed product categories. Actual furnace features vary by manufacturer and model.
These figures are intended as installed-price planning ranges in Canadian dollars and are shown before HST unless a quote states otherwise. Product attributes such as AFUE (Annual Fuel Utilization Efficiency) rating, furnace staging, blower type, and control features should match the actual equipment being quoted.
A standard installation generally means replacing a furnace with a similar type of unit where the existing ductwork, gas line, electrical connection, venting, drainage, and access conditions do not require major changes. Work beyond that scope can change the final price.
Residential gas furnaces commonly installed in Ontario today are high-efficiency condensing models. Condensing furnaces in the 96–98% AFUE range use a secondary heat exchanger and vent through PVC pipe instead of a metal flue, which is why replacing an older, non-condensing furnace often means new venting.
Pricing differences are therefore more often driven by AFUE within the high-efficiency range, heating stages, blower technology, controls, brand, warranty coverage, and installation complexity.
Furnace capacity affects equipment cost. The appropriate capacity should be determined from the home’s heating load rather than square footage alone.
The condition of your home’s existing systems has a real impact on price. Contractors need to account for the current venting, ductwork condition, gas line capacity, electrical connections, condensate drainage, and thermostat compatibility. Older systems that need upgrading in any of these areas add to labour time and materials.
Removal and disposal of the old furnace, installation of the new unit, and startup and testing all add labour time and contribute to the final price.
A furnace can combine several attributes at the same time. For example, one unit may be high-efficiency, two-stage, and equipped with a variable-speed blower. Instead of treating these as separate furnace types, it is more accurate to compare the features that affect price, comfort, and performance.
| Attribute | What It Means | How It Can Affect Cost |
|---|---|---|
| Single-stage heating | The furnace operates at one heating output when it turns on. | Usually lower upfront cost, but less precise comfort control than staged or modulating systems. |
| Two-stage heating | The furnace can operate at a lower heating output and a higher heating output. | Often costs more than single-stage equipment but can improve comfort and reduce temperature swings. |
| Modulating gas valve | The burner output can adjust across multiple or continuous levels to match heating demand more closely. | Typically found in premium systems and can increase upfront cost while improving comfort control. |
The bigger picture: The lowest upfront price is not always the best overall value. Efficiency, comfort features, maintenance requirements, repair history, warranty coverage and expected ownership period can all affect the total value of a furnace replacement.
A 2,000-square-foot home in Ontario can still fall anywhere within the broader furnace replacement price range. Square footage alone does not determine the correct furnace size or final replacement cost.
That’s because heating requirements depend on far more than the floor area. Insulation levels, window quality, ceiling height, home age, air leakage, layout, number of floors, existing ductwork conditions, and local climate exposure all factor into how much heat a home loses and how hard a furnace has to work to replace it.
Two homes can share an identical footprint and still have very different heating requirements, which is exactly what a proper heat loss calculation is designed to determine.
A simple example: Two Ontario homes can both be 2,000 sq. ft., but one might be a well-insulated newer build with upgraded windows, while the other is an older home with drafty windows and minimal attic insulation. The second home may have a higher heating load and could require a higher-capacity furnace, even though the two homes have the same floor area.
Repair may be the better option when the furnace is newer, reliable, and needs only a minor fix. Replacement becomes more practical when the system is older, repairs are frequent, comfort is inconsistent, or safety concerns are present.
| Repair May Make Sense When | Replacement May Make Sense When |
|---|---|
| The furnace is relatively young | The furnace is approaching the end of its expected lifespan |
| The needed repair is minor | Repairs are becoming more frequent |
| The system has otherwise been reliable | Major components are failing |
| Parts are readily available | The furnace’s measured performance has declined or operating problems persist after other causes have been ruled out |
| The furnace remains reliable and performance is acceptable. | Performance has declined or operating problems persist after other causes have been ruled out. |
| The repair cost itself is relatively low | Replacement parts are becoming hard to source |
There is no universal repair-cost percentage that determines when replacement makes sense. Compare the repair cost with the furnace age, warranty coverage, repair history, equipment condition, safety diagnosis, efficiency, expected remaining life, previous repair costs, and how soon replacement would realistically be needed.
Ontario Note: A furnace failure during an Ontario winter can quickly become a comfort issue and, during severe cold, may develop into a safety concern.
Safety comes before cost: a cracked heat exchanger can let carbon monoxide mix into the air your furnace circulates. Soot around the unit, unusual smells or a carbon monoxide alarm all call for immediate service.
Most residential furnaces last around 15–20 years, though actual lifespan varies based on installation quality, maintenance history, usage patterns, and operating conditions.
| Furnace Age | What Homeowners Should Consider |
|---|---|
| Under 10 years | Usually, it is worth investigating repair options first. |
| 10–15 years | A good point to evaluate efficiency, repair history, and overall condition. |
| 15–25 years | Evaluate the furnace’s condition, safety, reliability, repair history and replacement options more closely. |
| 20+ years | Have the system’s condition, reliability and safety assessed and compare repair costs with replacement options. |
In most cases, a 25-year-old furnace is a strong candidate for replacement planning because it is beyond the typical service-life range of many residential furnaces. Condition, safety, combustion performance, repair history and parts availability should still be assessed before making the final decision.
Ontario Note: Ontario’s long heating season means furnaces often run for many months each year. That makes maintenance history, installation quality, and equipment condition especially important as the system ages.
A straightforward like-for-like furnace replacement usually takes about one day, often four to eight hours on site. Jobs that need new PVC venting, duct modifications, a gas line upgrade or electrical work can take longer, and a required permit inspection may add a follow-up visit. Your contractor should include a time estimate with the written quote.
Do not compare furnace replacement quotes by price alone. A lower number may leave out work or protections that another quote includes. The goal is to compare the fully installed scope, not just the equipment price.
Ask for a written, itemized quote. An itemized quote makes it easier to see whether two contractors are pricing the same scope or offering different levels of equipment, labour, warranty, and installation support.
If you want help understanding what should be included, LG Home Comfort can walk you through the quote details before you commit.
Ontario rebate programs change frequently, so homeowners should verify current eligibility before assuming any furnace, heat pump, or HVAC upgrade qualifies. Current Home Renovation Savings information highlights rebates for efficiency upgrades such as heat pumps, insulation, smart thermostats, solar, and other eligible improvements.
Ontario’s Home Renovation Savings program is delivered by Save on Energy and Enbridge Gas with support from the Ontario government. Homeowners should review the official Home Renovation Savings Program page for current eligibility and rebate details. The program includes options for single and bundled upgrades and lists incentives for upgrades such as cold-climate heat pumps, ground-source heat pumps, smart thermostats, insulation, windows and doors, solar panels, battery storage, and qualifying appliances.
As of September 2026, the Home Renovation Savings program does not list a standard standalone natural-gas furnace replacement as a rebate category. Eligible upgrades currently include options such as qualifying heat pumps, insulation, smart thermostats, windows and doors, solar and battery storage, and other specified improvements. Always confirm current eligibility before purchasing.
The Canada Greener Homes Grant is closed. Natural Resources Canada states that the program is closed and that applications were open from May 2021 to February 2024. Homeowners should rely on current provincial or utility program details instead of older articles that may still reference expired federal grant information.
This raises a practical question worth asking before committing to a straight furnace-for-furnace swap: if you’re already replacing an aging furnace, does it make sense to compare that against a qualifying cold-climate heat pump instead? Depending on your home setup and current incentives, a heat pump may open rebate eligibility that a standard furnace replacement won’t.
Rebate information checked: September 2026. Programs, incentive amounts and eligibility requirements can change. Check the official program before purchasing equipment.
Before agreeing to any repair or replacement quote, check that each item below is clearly explained. LG Home Comfort can help homeowners review these details during the quote process so there are fewer surprises later.
After installation, a gas furnace should be started, commissioned and checked for safe operation before handover. Ask the contractor what combustion, gas-connection, venting, airflow and safety-control checks are completed and documented as part of commissioning.
Whether a formal heat-loss calculation must be submitted can depend on the project, municipality and permit requirements. Regardless of submission requirements, furnace capacity should be selected from the home’s actual heating load rather than square footage alone. Ask your contractor what sizing method and documentation will be used for your replacement.
Installation time varies with the existing furnace, venting, ductwork, electrical requirements, access conditions and any required upgrades or inspections. A straightforward replacement may require less work than a project involving significant system modifications, so your contractor should confirm the expected timeline before installation.
Not automatically. Reuse depends on whether the existing vent system meets the new furnace manufacturer’s requirements and applicable installation requirements. The contractor should evaluate vent material, diameter, length, routing, termination and condition before confirming whether any part of the existing venting can remain.
It can make sense if both systems are aging, if the indoor blower, controls or other connected HVAC components need updating, or if you want to compare a heat-pump or hybrid-system option.
In many Ontario homes, a heat pump can be paired with a furnace in a dual-fuel system. Depending on the equipment and control strategy, the heat pump can provide heating during milder conditions and the furnace can provide supplemental or backup heat when required.
For natural-gas furnace work in Ontario, verify that the business is a registered TSSA fuels contractor and that the technician performing the work holds the appropriate fuel-safety certification. Homeowners can check the contractor through TSSA’s authorized heating-fuel contractor registry
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