What the testing shows
Natural Resources Canada field-tested cold-climate air-source heat pumps in Canadian homes. The average coefficient of performance was about 3.0 at +4.9 C and about 1.5 at -21.1 C. So a heat pump still delivers more heat than the electricity it uses at -21 C, but far less of an advantage than in mild weather. Performance drops further in extreme cold, and a system sized only for average weather can fall short in a cold snap.
Every province gets cold, Ontario included
The same question comes up in Ontario, Quebec, Manitoba and the Maritimes, so this is not only a prairie issue. The NRCan field test measured cold-climate heat pumps in Canadian homes, not in a lab, and the cold-climate list that Ontario's Home Renovation Savings requires is built around -15 C performance. Anywhere you see real winter, the same three rules apply: buy a cold-climate rated model, get a load calculation, and plan for backup heat on the coldest nights. Our Ontario hub and BC hub show the local rebates, and the stacking guide compares provinces.
Count your cold hours, not your fears
People often overstate how long their winter lows last. Look up the hours your town spends below -25 C in a typical winter, not just the coldest night. That number tells you how often a backup would run. Our Calgary heat pump page and the Alberta hub use local climate data. Wind chill does not matter to a heat pump. The outdoor air temperature does.
Pick a unit built for the cold
- Use a cold-climate model, not a standard one. Ontario's heat pump stream, for example, requires a unit that keeps at least 70 percent of its capacity at -15 C with a COP of at least 1.8 at that temperature. That is a good yardstick anywhere.
- Ask for a written heat load calculation so the unit is sized for your house and not guessed.
- Keep a backup heat source for the coldest hours: your existing furnace, or electric heat strips. A smart thermostat can switch over at a set outdoor temperature.
The money question
The cost question is a fair one. We found no province-wide heat pump rebate in Alberta, and the earlier federal Oil to Heat Pump Affordability program closed on July 31, 2026. Calgary's Clean Energy Improvement Program offers financing up to $50,000, but intake is closed until winter 2026 to 2027. We have not verified Saskatchewan programs, so we do not quote any.
That is why the new National Heat Pump Rebate matters on the prairies. It pays up to $10,000 below the median income and $2,000 above, and it is meant to launch in early 2027. Ottawa says average savings are more than $1,400 a year for homes switching from oil, propane or electric resistance heat. It does not say how gas homes are treated, which is the biggest question here. Read our guide for gas homes before you decide.
Who gains the most
The clearest wins are homes heated by electric baseboards, propane or oil, especially rural homes without a gas line. A home on cheap natural gas may see little or no saving. Our wait-or-buy guide helps you decide on timing.
A word on emissions
Some readers ask whether a heat pump helps if the grid burns fossil fuels. We have not audited each province's grid, so we will not quote a number. The heat pump delivers more heat per unit of electricity than baseboards do, which is why even a fossil-heavy grid does not cancel the gain against electric resistance. For an exact figure, ask your utility for its emissions factor.
Common questions
Do heat pumps work at -30 C?
Many cold-climate units keep running, but with lower capacity and efficiency. NRCan measured an average COP near 1.5 at -21 C. Keep backup heat for the coldest hours.
Can a heat pump be my only heat in Alberta?
Some homes do it, but we recommend a backup source for extreme cold. Ask your installer for a load calculation.
Is there an Alberta heat pump rebate?
We found no province-wide rebate. The new federal rebate may be the main one when it launches in early 2027.
What about Saskatchewan?
We have not verified Saskatchewan heat pump programs, so we do not list any. Check back as we add them.
Is geothermal better in the cold?
Ground-source systems are less affected by air temperature, but cost more to install. Ask for quotes.
Is Ontario cold enough to be a problem?
Ontario winters are well within what cold-climate heat pumps are built for, but most homes still benefit from backup heat on the coldest nights. Buy a model on the NRCan cold-climate list.
More on the federal heat pump rebate
- National Heat Pump Rebate: everything confirmed so far
- Should you wait for the federal rebate?
- What stacks: federal and provincial rebates
- Heat pump on a natural gas home
- How to get a fair heat pump quote
- Renters, condos and landlords
Sources, read October 9, 2026: Natural Resources Canada: cold-climate heat pump field test, Prime Minister of Canada: news release, City of Calgary: Clean Energy Improvement Program, Home Renovation Savings.