Do Heat Pumps Work in Calgary's Cold Weather?

The Heat Pump Question Every Calgary Homeowner Is Asking

Heat pumps have been getting a lot of attention as a cleaner, more efficient alternative to natural gas furnaces. But Calgary's winters regularly hit -25°C or colder, and many homeowners are rightfully skeptical. Do heat pumps actually work when it matters most?

The short answer is yes — but with important nuances that every Calgary homeowner should understand before investing.

How Heat Pumps Work

A heat pump does not generate heat the way a furnace does. Instead, it moves heat from outside air into your home. Even at -20°C, outdoor air contains thermal energy that a heat pump can extract and concentrate indoors.

This process is remarkably efficient. For every unit of electricity a heat pump consumes, it delivers two to four units of heat — a ratio called the Coefficient of Performance (COP). At mild temperatures, heat pumps are two to four times more efficient than electric resistance heating. The efficiency decreases as temperatures drop, but modern cold-climate heat pumps maintain meaningful efficiency well below -20°C.

Cold-Climate Heat Pumps: A Game Changer

Standard heat pumps from a decade ago lost most of their efficiency below -10°C and were genuinely impractical for Calgary winters. Modern cold-climate heat pumps have changed that equation dramatically.

Leading cold-climate models from Lennox, Mitsubishi, and Bosch are rated to operate at full capacity down to -15°C and continue providing heat (at reduced efficiency) down to -25°C or colder. Lennox's XP25 heat pump, for example, maintains over 70% of its rated capacity at -18°C.

For Calgary's climate, this means a properly sized cold-climate heat pump can handle the vast majority of heating hours in a typical winter. The coldest days — those extreme -30°C snaps — are when a backup heat source becomes important.

Do You Still Need a Furnace?

Most Calgary heat pump installations use a dual-fuel system: a heat pump paired with a gas furnace as backup. The system automatically switches between the two based on outdoor temperature and which source is more economical at any given moment.

In mild weather, the heat pump runs almost exclusively. As temperatures drop, the furnace takes over when it becomes more efficient. This hybrid approach gives you the efficiency benefits of a heat pump for most of the year while ensuring your home stays warm even during extreme cold.

All-electric heat pump systems without a gas backup are viable in Calgary, but require careful sizing and typically use electric resistance backup heating for the coldest days. This is more common in well-insulated newer homes.

The Economics of Heat Pumps in Calgary

The financial case for heat pumps depends heavily on your current energy costs and how much you heat your home.

Natural gas in Alberta is relatively inexpensive compared to electricity. This means the economic advantage of heat pumps over gas furnaces is smaller in Calgary than in provinces with higher gas costs or lower electricity rates.

However, the efficiency gap is significant. A gas furnace converts fuel to heat at 80 to 96% efficiency. A heat pump delivers 200 to 400% efficiency at mild temperatures. During Calgary's shoulder seasons — October, November, March, April — when temperatures are above -10°C, heat pumps are dramatically cheaper to operate than gas.

A dual-fuel system optimizes for cost automatically, using whichever energy source is cheapest at any given temperature.

Available Rebates for Heat Pumps in Calgary

The financial case for heat pumps in 2026 is strengthened by significant rebate programs. The Alberta Home Energy Retrofit Accelerator offers up to $5,000 for qualifying heat pump installations. The federal Canada Greener Homes Loan provides interest-free financing up to $40,000 for the full project.

Combined, these programs can dramatically reduce the upfront cost of a heat pump installation, improving your payback timeline considerably.

Is a Heat Pump Right for Your Home?

Heat pumps work best in well-insulated homes where the heating load is moderate. Older homes with poor insulation or drafty windows require more heating capacity, which can make sizing a heat pump more expensive.

The best way to find out if a heat pump makes sense for your specific situation is to have a professional evaluate your home's heating load, insulation, current energy costs, and available rebates.

Talk to Infills Mechanical

We install and service cold-climate heat pumps from Lennox across Calgary and the surrounding area. Book a free consultation and we will assess your home, calculate your potential savings, and help you decide whether a heat pump — alone or paired with your existing furnace — makes financial sense for you.