Will it still heat at minus 30?
Do heat pumps work in Canadian winters?
Yes, the right ones do. Natural Resources Canada says cold climate heat pumps can operate when outdoor air is as cold as minus 30 C. In a colder snap, supplemental heat may be needed. Minimum operating temperatures differ by model, so ask for the spec sheet of the exact unit you are quoted.
What Natural Resources Canada says about the cold
Natural Resources Canada (NRCan) calls these systems cold climate heat pumps. It says they combine variable capacity compressors with improved heat exchanger designs and controls. The goal is more heating output at colder air temperatures. Source: NRCan, Heat pumps (Canada Greener Homes Initiative).
That page says they can operate at outdoor air temperatures as cold as minus 30 C. It adds that below minus 30 C, supplemental heating may be required.
Cold climate versus a regular air source heat pump
A separate NRCan page, Heating and cooling with a heat pump, says newer air source models have a minimum operating temperature that can range from -15 C to -25 C. Below that, the unit stops and another heat source takes over.
So the number depends on the unit. A model rated for minus 30 C and one rated for minus 15 C are not the same purchase. The spec sheet is where you find out which one you are getting.
What backup heat is for
NRCan says air source systems need a supplemental heating source. It may also cover defrost cycles. Most homes keep what they have: a furnace, baseboards or a boiler. Backup heat is normal, not a failure.
Ask your installer how the backup is wired and when it switches on. Ask what the unit does on your coldest nights.
What this means for your rebate
Many programs care which unit you buy. BC asks for a unit on its eligible list. Nova Scotia asks for one on its qualifying list. The federal list is due as of November 1, 2026. A cold climate unit is not automatically on a list, so check before you book.
The federal National Heat Pump Rebate is described on canada.ca as "a grant of either $2,000 or up to $10,000 (for low- to median-income households)". Estimate, not guaranteed. Last checked 2026-10-22. Read it on the canada.ca page. The portal is expected in early 2027, and the criteria and eligible equipment list are due as of November 1, 2026. Provincial programs are separate, so check your province page before you book.
Province pages: Ontario, Quebec, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Nova Scotia, Alberta. Steps before you install: how to apply.
More on heat pumps and cold
Can a heat pump be my only heat at minus 30?
NRCan says cold climate models can operate as cold as minus 30 C, and that supplemental heat may be needed below that. Whether yours can be the only heat depends on the model and your house. Ask for the spec sheet.
Does a heat pump work in Alberta, Saskatchewan or northern Ontario?
The same sources apply anywhere in Canada. Look at the minimum operating temperature of the unit, not the postal code. See the Alberta page for what is open there.
Is a ground source heat pump better in the cold?
NRCan says ground source systems keep operating regardless of the outdoor temperature. They are a different system with different costs and rebates.