Toronto pricing
Furnace Replacement Cost in Toronto
$3,800 – $8,200installed
A new gas furnace installed in a GTA home typically lands between $3,800 and $8,200 all-in. The spread is real, not padding: a mid-efficiency swap into an existing, correctly sized duct system sits near the bottom, while a two-stage or modulating unit with new venting, a chimney liner and electrical work sits near the top.
Old-city work carries access costs that suburban work does not: permit parking on narrow streets, laneway-only rear access, tight basement stairs that limit equipment size, and third-floor or rooftop terminations that need ladder or lift time.
Instant Price Estimator
Furnace Replacement Cost · Toronto
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Price breakdown
What each price band actually buys in Toronto
Quotes for the same job differ because the scope differs. This is what separates a low quote from a high one.
| Tier | Price range | What it includes |
|---|---|---|
| Budget | $3,800 – $5,000 | Single-stage 96% AFUE, straight swap, existing venting reused, standard 1,000–1,800 sq ft home. |
| Typical | $5,000 – $6,800 | Two-stage ECM furnace, new PVC venting, new thermostat, detached home, 10-year parts warranty. |
| High | $6,800 – $8,200+ | Modulating variable-speed unit, chimney liner for the water heater, duct modifications, difficult basement access. |
Ranges reflect current Toronto & the GTA market pricing and are not a quote. Your written price is confirmed on site before work begins.
The detail
How furnace replacement cost is priced
Installed price covers the furnace itself, removal and disposal of the old unit, new venting where the existing run cannot be reused, gas and electrical connections, a fresh thermostat where needed, and the TSSA-required commissioning readings. If a quote is thousands below the range above, check what has been left out — venting and permits are the two line items most often quietly dropped.
Sizing matters more to your bill than brand does. An oversized furnace short-cycles, wears out its ignition components early and leaves the far end of the house cold, and it is the single most common mistake we find when replacing a unit installed less than ten years ago. A heat-loss calculation should come before any model is recommended.
Ontario homeowners replacing a mid-efficiency unit should also price a heat pump alongside the furnace. A dual-fuel setup costs more up front but can qualify for federal and provincial incentives that change the ten-year math substantially.
In Toronto, Inside the old city you are mostly looking at pre-1940 semis and rowhouses with narrow mechanical rooms, converted gravity ductwork and masonry flues that predate gas. The post-war belt through Etobicoke, North York and Scarborough is bungalows and side-splits on their second or third furnace, and the infill and condo-adjacent stock downtown is high-efficiency and direct-vented from the start. That shows up directly in what this job costs here compared with the rest of the GTA.
What pushes the price up
- Moving from a chimney-vented unit to a high-efficiency one — the water heater then needs a liner
- Undersized or unbalanced ductwork that has to be modified to carry the new airflow
- Tight or shared mechanical rooms, especially in downtown Toronto row housing
- Modulating and variable-speed equipment versus single-stage
- Winter emergency replacement versus a planned shoulder-season install
What brings it down
- Booking in spring or early fall instead of the first cold snap
- Reusing sound venting and a compatible thermostat
- Bundling the furnace and AC in one visit — one crew, one setup
- Available federal and Ontario efficiency incentives on qualifying equipment
FAQ
Furnace Replacement Cost questions we get asked
How much does a new furnace cost in Toronto?
Installed, most GTA furnace replacements fall between $3,800 and $8,200. A straightforward single-stage 96% AFUE swap in a townhouse is near the bottom; a modulating unit in a detached home needing new venting and a chimney liner is near the top.
Is it cheaper to repair or replace my furnace?
As a rule, if the unit is over 15 years old and the repair is more than a third of replacement cost, replacement is the better financial decision. Under 10 years old, repair almost always wins. We give you both numbers before you decide.
How long does a furnace installation take?
A standard replacement is a one-day job, usually six to eight hours. Add half a day if venting has to be re-run, a chimney liner is installed, or ductwork is modified.
Do I need a permit to replace a furnace in Ontario?
Gas work must be performed by a TSSA-registered contractor, and municipalities differ on mechanical permits. We handle the registration and inspection paperwork for your municipality as part of the install.
What size furnace do I need?
It is determined by a heat-loss calculation based on square footage, insulation, window area and orientation — not by the size of the old unit. Most GTA homes need 60,000–100,000 BTU, and oversizing is the most common installation error we see.
Does a new furnace come with a warranty?
Manufacturers typically provide 10 years on parts and 20 years to lifetime on the heat exchanger when the unit is registered after install. Labour warranty is separate and stated on your quote.
Pricing in nearby cities
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