Quick answer
A financed furnace in the GTA usually lands between $60 and $150 a month. As a rough guide, a $5,000 high-efficiency furnace on a 10-year term sits near $60–$75 a month depending on the rate, while a $12,000 furnace-and-AC or heat pump package over the same term runs roughly $140–$170. The term, the rate and any admin fee decide the rest.
A furnace financed over a typical term costs most GTA households somewhere between $60 and $150 a month, and where you land inside that band has less to do with the furnace than with the four numbers on the credit agreement. Two homeowners buying the identical unit on the same street can have payments that differ by half, purely on term length and rate. Here is how the payment is put together, and what to look at besides it.
The four numbers that set your payment
- Amount financed — the installed price minus any deposit, and minus a rebate only if the program pays before you close the loan
- Interest rate, and whether it is fixed for the term or resets partway through
- Term length, from 12 months out to 15 years on some lenders' HVAC programs
- Fees — administration or setup charges that get rolled into the principal and quietly raise the payment
What that looks like on real system prices
A high-efficiency furnace installs for $4,500–$7,500, a furnace and air conditioner together for $7,500–$11,500, and a cold-climate heat pump for $9,500–$15,000 before rebates. Using the two anchors above, a $5,000 furnace on 10 years lands near $60–$75 a month and a $12,000 combined system near $140–$170 — so a package sitting between those prices sits between those payments. Ask any contractor to show you the payment on each equipment tier they quote, not just on the one they would like you to buy.
Longer term, smaller payment, bigger total
Stretching a term lowers the monthly number and raises what the furnace costs you in the end, because you are paying interest for more years. In Ontario the lender has to disclose the total cost of borrowing on the agreement — that box is the honest comparison between two offers, not the payment. A useful sanity check: your term should not outlast the equipment. Financing a furnace over 15 years means the last payments arrive when the unit is already near the end of its service life.
Rebates arrive after the install — plan the lump sum
Ontario efficiency rebates are paid out after the work is done and verified, which means you generally finance the full installed price and receive $500–$7,500 back weeks later, depending on the system. The smart move is to put that cheque straight onto the loan as a lump-sum prepayment, which shortens the term rather than trimming the payment. That only works if your agreement allows prepayment without penalty — ours does, because we finance through lending partners with no prepayment penalty. See what you qualify for on our furnace rebate page.
Is a monthly payment the same as renting a furnace?
No, and this is the single most expensive mistake in Ontario home comfort. Financing has a payoff date and ends with you owning the equipment. A rental has a monthly charge that rises with annual increases and never ends — the same trap that makes a rented water heater at $25–$45 a month cost several times the price of buying one outright over its life.
If a door-to-door offer quotes you a low monthly figure and cannot show you a payoff date or a total cost of borrowing, it is a rental contract. Our comparison of renting versus buying equipment applies to furnaces just as directly.
What to check before you sign
- The payoff date and the total cost of borrowing, in writing on the agreement
- Whether you can prepay in full or in part without a penalty
- What happens at the end of a promotional or deferred-payment period, since deferred interest can be backdated to day one
- Whether the contract tries to register anything against your title — Ontario banned new notices of security interest (NOSIs) on consumer goods such as furnaces in 2024, so a lender still asking for one is a red flag
- That the furnace itself is right for the house before you finance it — what size furnace you need comes before what it costs per month
Common questions about financing a furnace
- Is 0% financing real? Sometimes, and the cost is usually in the price: a no-interest offer priced above the cash quote is a loan with the interest built in. Ask for the cash price and the financed price side by side, and compare the total cost of borrowing on each.
- Should I finance a repair or a replacement? A repair, rarely — most run $150–$800 and are paid on the day. A $1,500–$3,000 heat exchanger on a 15-year-old furnace is the classic case where financing a new unit beats paying cash for the old one; repair vs. replacement sets out the rule.
- What rate will I get? The lender sets it from your credit, not the contractor. Ask what the rate is at your tier before signing, because the same $5,000 furnace at two different rates is two different totals, and the payment alone hides that.
We will quote the installed price, the rebate you qualify for and the monthly payment side by side, so you can see what the furnace costs rather than only what it feels like. Look at heating services for the equipment side, our financing options for the money side, and ask for both in writing.