What Does a New Furnace Cost in the GTA?

Frequently asked questions

How much does a new furnace cost in Toronto in 2026?

Between $3,000 and $10,000 installed before HST across the four Canadian sources behind this page, and where you land inside that is decided mostly by efficiency tier. By efficiency tier, and each of these is a span across sources whose bands do not line up rather than one contractor’s range: an 80 percent unit runs $2,000 to $5,500, a 95 to 96 percent single stage $3,500 to $5,500, a 96 percent two stage $4,000 to $7,500 and a 98 percent modulating unit $5,500 to $10,000 or more. Ontario HVAC Quotes is the only source of the four that states a typical rather than a range, and puts the provincial average around $6,800 before taxes.

Why does the calculator price all four efficiency tiers at once?

Because that is the choice actually in front of you, and one number hides it. The gap between the cheapest and dearest tier on the same job is larger than any single extra on the quote except major ductwork. Seeing four prices side by side with your own extras applied to each of them is the difference between comparing quotes and being talked into one.

Why does ticking PVC venting not change the 80 percent price?

Because an 80 percent furnace does not condense. It sends hot exhaust up the existing chimney the way the old one did, so there is no PVC to run and no condensate to drain. That line exists only when you move to a condensing unit, and so does the chimney liner line beneath it: if a gas water heater was sharing that chimney, taking the furnace off it leaves the water heater drafting alone, and Ontario HVAC Quotes prices the liner that sometimes follows at $2,500 to $5,000. It is the most commonly missed item on a Toronto conversion quote.

Are furnace rebates still available in Ontario?

Not for the furnace itself. Megacity HVAC's cost guide states plainly that furnace rebates ended in 2025. Ontario's current Home Renovation Savings programme is built around heat pumps and other envelope upgrades rather than gas furnaces, which is worth knowing before a quote is presented to you as though a rebate is coming off it. The rebate finder on this site shows which GTA installers are registered for that programme.

What size furnace does my house need?

Not the one the old furnace was, and probably not the one square footage suggests. Ontario Building Code 9.33.2.2 requires the output to come from a CSA F280 heat loss calculation stamped by a BCIN holder, sized against Toronto's -18 degree design temperature. Ontario Heat Loss reports that most Ontario furnaces are oversized by 30 to 50 percent as a result of skipping it, and an oversized furnace costs more to buy and short cycles once it is in.

Should I replace the furnace or put in a heat pump?

If the ductwork, the venting and the electrical panel are all going to be touched anyway, that visit is the cheapest moment to price both, because doing the same work twice costs more than doing it once. What separates the two is running cost and cold weather output rather than the invoice, and both of those have their own calculator on this site. Replacing a furnace with a furnace is the simpler and usually cheaper job in a house already on gas; it is also a decision you will not revisit for fifteen years.