Short answer: Every cold-climate heat pump has two temperatures on its spec sheet: the coldest it will run, and the coldest it still gives full heating power. The second number matters more. Your rebate may also depend on it.
Carrier's own page is a good example. It says its Infinity 21 Ultimate Cold Climate heat pump (27VNA1) operates "down to -23°F" and keeps "100% capacity at 5°F". Available: maker page read
| In °F | In °C | What it means | |
|---|---|---|---|
| Coldest it will run | -23°F | about -31°C | It keeps heating below this point only in a reduced way, or stops. |
| Coldest at full capacity | 5°F | -15°C | Down to here it delivers all the heat it is rated for. |
So "rated to -15°C" usually points to the full-power number. Below it, the heat pump still helps, but a backup heat source may do some of the work. A different Carrier model (27VNA3) is listed as running down to -15°F, about -26°C. The same brand can have very different ratings, so read the exact model.
Source: Carrier cold climate heat pump page, read September 30, 2026. Carrier also states that it completed the U.S. Department of Energy's Cold Climate Heat Pump Challenge.
Trade press reports that Carrier, Lennox, Bosch and Trane had cold-climate models on the market by the end of 2025, and that Daikin and Rheem were expected to follow in 2026. Reported: trade press, not confirmed with each maker TCL also showed new cold-climate systems at the AHR Expo 2026 trade show. We have only read Carrier's page so far, so treat the others as leads to check, not as facts.
Sources: Propmodo, TCL press release.
| Where | What the program asks |
|---|---|
| BC Hydro | The whole-home rebate (up to $4,000) needs the heat pump to meet 100% of your heating at -5°C, plus an eligible model and a Home Performance Contractor Network installer. Details |
| Ontario Home Renovation Savings | Pays $1,250 per ton, up to $7,500, for a cold-climate air-source heat pump when you heat with electricity, oil, propane or wood. Ontario calculator |
| Mass Save | Needs an ENERGY STAR cold-climate model from a Heat Pump Installer Network contractor. Massachusetts calculator |
Comparing brands? Read Bosch vs Mitsubishi vs Daikin. Ready to price one? See top-rated installers in your city.
Model lists and ratings for Lennox, Bosch, Trane, Daikin and Rheem's 2026 launches. Prices for any brand.
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