Heat Pump vs Gas Furnace: How to Choose a Heating System for Your Ontario Home
Lower bills, rebates, and cold-snap performance — three real trade-offs, plus the compromise most homeowners should actually pick
Heat pump or gas furnace — which is the smarter choice for an Ontario home?
For most GTA homes, the practical answer is a hybrid system — a heat pump as the main source, with the gas furnace kept as a deep-cold backup. Modern cold-climate air-source heat pumps run down to about -25°C, but efficiency drops noticeably below -15°C, where gas becomes cheaper on the coldest days. Enbridge’s Home Renovation Savings (HRS) rebate (launched Jan 28, 2025, replacing the old HER+) pays gas-heated homes $500 per ton of heat-pump capacity, up to $2,000; non-gas homes get $1,250/ton. The federal Greener Homes Grant closed to new applicants in 2024, but the interest-free Greener Homes Loan (up to $40,000, 10-year term) still stacks with provincial rebates.
Sources: Enbridge Gas, "Home Renovation Savings"; Natural Resources Canada (Greener Homes Loan). Operating temperatures and cost figures are industry estimates — confirm against your home and quotes.
“Arthur, my furnace is almost twenty years old and due for replacement — do I go heat pump or just buy another gas furnace?” It’s one of the most common questions I get lately. Three things are really pulling against each other underneath it: which costs less to run, how much rebate you can get, and whether a heat pump can actually handle a Canadian winter. Let me break down those three trade-offs, then tell you why most GTA homeowners land on the same compromise.
Start with the fundamental difference
A gas furnace burns — it produces heat by burning natural gas, full power even at -30°C, which is why Ontario homes have relied on it for decades. A heat pump moves heat — like an air conditioner in reverse, it pulls heat from outside air into your home, so its efficiency can far exceed 100% (one unit of electricity moves two to three units of heat indoors). The same heat pump becomes your air conditioner in summer. The catch: a furnace doesn’t care how cold it is but burning gas has a cost, while a heat pump is very cheap to run most of the time but works harder the colder it gets.
Trade-off 1: Running cost — the heat pump wins most of the time
Trade-off 2: Rebates — what you can actually get now
ℹ️Rebate amounts, caps, and eligibility shift as programs update. Before you get quotes, verify the current Home Renovation Savings numbers on Enbridge Gas’s site — don’t copy figures from a months-old post.
Trade-off 3: Will it keep you warm? — the worry I hear most
💡 A hybrid system = a heat pump + keeping your existing gas furnace as backup. The efficient heat pump handles heating most of the time (and cooling in summer), cutting your bills; on the GTA’s coldest nights it automatically switches to the gas furnace for warmth at the cheaper cost. The key: you do not need to remove your gas furnace to install a heat pump, and this hybrid configuration still qualifies for the HRS rebate. For the vast majority of GTA homes, this is the answer that balances savings, comfort, and rebates.
⚠️“Installing a heat pump means ripping out the furnace” is a common myth. A hybrid system specifically keeps the gas furnace for deep cold — and still qualifies for the rebate. Don’t let a sales pitch push you off it.
There’s a real-estate angle here too
When I tour homes with clients or prep a listing, the condition and age of the HVAC system is something buyers care about. A recently installed, efficient heat pump or hybrid system is a genuine selling point — it signals a well-maintained home and gives buyers the “lower bills” story. A nearly-twenty-year-old furnace, conversely, often becomes a lever buyers use to negotiate price or demand repairs. If you’re prepping to sell and the heating system is due anyway, planning this step ahead often pays back more than just the rebate.
Frequently Asked Questions
Do I have to remove my gas furnace to install a heat pump?
No. The most popular setup among GTA homes is the hybrid — a heat pump as the main source with your existing gas furnace kept as a deep-cold backup — and it still qualifies for the Enbridge HRS rebate. You get the everyday savings and the coldest-night warmth.
Will a heat pump keep me warm in a Canadian winter?
Modern cold-climate heat pumps run down to about -25°C, but efficiency drops below -15°C. If your area regularly hits deep cold, a heat-pump-only setup struggles — which is why the hybrid (heat pump + gas backup) is the mainstream choice.
How much rebate can I get right now?
Provincially, Enbridge Home Renovation Savings (which replaced HER+ on Jan 28, 2025): $500/ton up to $2,000 for gas homes, $1,250/ton for non-gas. Federally, the interest-free Greener Homes Loan (up to $40,000, 10-year) can stack. Amounts change — check Enbridge’s site first.
Long-term, which is cheaper to run?
A heat pump is cheaper most of the heating season (high efficiency); gas is cheaper on the few deep-cold days below -15°C. So the cheapest answer is often not either/or but a hybrid — letting each work in the temperature range where it’s most economical.
Arthur Zhao
Real Estate Broker · FRI · ABR · SRS · PSA · MCNE · E-PRO · GUILD Elite
VP & Branch Manager, Bay Street Group Inc.
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