The Complete Heat Pump Guide for Canadian Homeowners

Why Heat Pumps Are Having a Moment in Canada

A few years ago, heat pumps had a reputation problem in Canada: 'They don't work in cold weather.' That reputation was earned by older technology. Today's cold-climate heat pumps — like the Lennox XP21 — operate efficiently at temperatures as low as -30°C, making them genuinely viable for Ontario winters.

Combine that with government rebates of up to $7,500, rising natural gas prices, and growing environmental awareness, and it's no surprise that heat pump installations in Ontario have tripled since 2022. This guide gives you the unbiased facts you need to decide if a heat pump is right for your home.

A heat pump extracts heat from outdoor air and moves it inside — even when it's very cold outside. This seems counterintuitive, but air at -20°C still contains a significant amount of thermal energy. The heat pump uses a refrigerant with a very low boiling point to absorb this energy, compress it to a higher temperature, and release it inside your home.

The key metric is COP (Coefficient of Performance) — the ratio of heat output to electrical energy input. A good cold-climate heat pump delivers a COP of 2.0 or higher at -15°C, meaning it produces 2 units of heat for every 1 unit of electricity consumed. Compare this to electric baseboard heaters, which have a COP of exactly 1.0.

The right choice depends on your specific situation — electricity rates, gas rates, home size, insulation quality, and how cold your winters get. In most of Ontario, a dual-fuel system (heat pump + gas furnace backup) delivers the best combination of efficiency, comfort, and cost.

A heat pump handles all heating above approximately -15°C (which covers about 95% of Ontario heating hours). The gas furnace kicks in only on the coldest days. This hybrid approach maximizes the heat pump's efficiency advantage while ensuring you're never left cold during extreme weather.

A complete cold-climate heat pump installation in Ontario typically costs $5,000–$12,000 before rebates, depending on the unit size, brand, and whether you're adding it to an existing system or replacing everything. A full dual-fuel system (heat pump + new furnace) runs $10,000–$18,000 before rebates.

After applying available rebates (OHERplus, utility rebates, and any applicable federal programs), many homeowners can meaningfully reduce their net cost. The payback period on the incremental cost over a standard furnace replacement varies by system and energy use — ask us for a current rebate assessment with your quote.

Heat pumps work best in well-insulated homes. If your home has significant air leaks or poor insulation, the heat pump will work harder and cost more to run. Before installing a heat pump, it's worth addressing major insulation gaps — insulation upgrades may also qualify for provincial or utility rebate programs.

Your electrical panel also needs to be assessed. A heat pump requires a dedicated 240V circuit, typically 30–60 amps depending on the unit size. Many older Ontario homes have 100-amp panels that may need upgrading. We assess this during our free consultation.

Ontario's electricity grid is one of the cleanest in North America — approximately 90% non-emitting (nuclear, hydro, wind, solar). This means a heat pump running on Ontario electricity produces dramatically fewer greenhouse gas emissions than a gas furnace, even accounting for the electricity generation.

As Ontario's grid continues to decarbonize, the environmental advantage of heat pumps will only grow. A heat pump installed today will become progressively cleaner over its 15–20 year lifespan as the grid improves.

Common Heat Pump Questions