This is one of the most common questions we get from Toronto homeowners replacing their heating system. The short answer: both work well in Ontario — but they work differently, cost differently to run, and suit different homes. The right choice depends on your current setup, your priorities, and your budget.
Let's break it down clearly.
How Each System Works
A gas furnace burns natural gas to generate heat, which is blown through your ductwork and into each room. It's the system most Toronto homes were built with. Simple, reliable, and very effective even in extreme cold.
A heat pump doesn't generate heat — it moves it. In winter, it extracts heat energy from outdoor air (yes, even at -25°C there is heat energy in the air) and moves it inside. In summer, it reverses: it pulls heat out of your home and dumps it outside, acting exactly like an air conditioner. One system, year-round comfort.
Do Heat Pumps Actually Work in Ontario Winters?
This is the most common concern — and it's outdated. Modern cold-climate heat pumps from brands like Mitsubishi Hyper-Heat, Daikin, and Bosch are designed specifically for climates like ours. They maintain full heating capacity at -15°C and can operate efficiently down to -25°C and below.
Toronto's average winter low is around -10°C. On our coldest nights — maybe -20°C to -25°C — cold-climate heat pumps still function, though their efficiency drops somewhat. Many homeowners keep a gas backup or use dual-fuel systems (heat pump down to -10°C, gas furnace kicks in below that) for maximum efficiency year-round.
Side-by-Side Comparison
| Feature | Heat Pump | Gas Furnace |
|---|---|---|
| Heating & Cooling | One system does both | Heating only (need separate AC) |
| Operating Cost | 2–3× more efficient than electric | Depends on gas prices |
| Cold Weather Performance | Excellent (cold-climate models) | Consistent at any temperature |
| Installation Cost | $4,000–$12,000+ | $3,000–$7,000 |
| Available Rebates | Up to $5,000+ | Minimal |
| Environmental Impact | Lower emissions | Burns fossil fuel |
| Needs Ductwork | Ducted or ductless options | Yes (ducted only) |
When a Gas Furnace Makes More Sense
- Your home gets to -25°C or colder regularly and you want maximum heat output at all times
- You already have a working central AC and just need to replace the heating
- Upfront cost is your primary constraint (furnaces have lower install cost)
- Your home has no existing ductwork and a ducted heat pump isn't feasible
When a Heat Pump Makes More Sense
- You need to replace both your furnace and your AC at the same time
- You want to lower your carbon footprint and energy bills long-term
- You're in a home without ductwork (ductless mini-split heat pumps are ideal)
- You want to take advantage of available government rebates
- You're doing a new build or major renovation
The Dual-Fuel Option: Best of Both
Many Ontario homeowners are choosing a dual-fuel system — a cold-climate heat pump paired with a gas furnace backup. The heat pump handles all heating and cooling down to around -10°C (when it's most efficient). When it drops below that, the gas furnace kicks in automatically. You get the efficiency of a heat pump most of the year, with the reliability of gas on the coldest nights.
This approach also makes sense if you already have a newer gas furnace — you can add a heat pump for cooling and moderate-weather heating without replacing the furnace.
Our Recommendation
There's no single right answer. It depends on your home, your existing equipment, and your goals. What we do recommend: have a real conversation before deciding. Any contractor who quotes you a system without asking about your current setup, your energy bills, and your priorities isn't doing the job properly.
At Alderwood Mechanical, we install both gas furnaces and cold-climate heat pumps across Toronto and the GTA. We'll give you a straight answer about what makes sense for your specific situation — no upselling, no pressure. Call us at 437-229-8618 to talk it through.
Alderwood Mechanical serves Toronto, North York, Scarborough, Etobicoke, Mississauga, Vaughan, Markham, Oakville, and surrounding GTA. G1 licensed gas fitters. No contracts. Upfront pricing.