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Cold-climate heat pumps for Montana

Across the 369 ZIP-code areas in Montana, the winter design temperature runs from −15°F to 3°F for most areas, with a median of −9°F.

The design temperature is the annual 99% value: only the coldest 88 hours of an average year fall below it. Each area takes it from the nearest weather station, 2015 to 2024.

Winter design temperatures across Montana

ZIP-code areas in Montana, by design temperature
Design temperature Areas Share
Below 5°FNo certified heating figure 368 99.7%
5 to 17°F 1 0.3%
17 to 47°F 0 0%
47°F and above 0 0%
Coldest areas in Montana
Place ZIP code Design temperature
Loring Colony 59537 −21°F
Saco 59261 −21°F
Turner Colony 59542 −21°F
Warmest areas in Montana
Place ZIP code Design temperature
Yaak 59935 9°F
Bonner-West Riverside 59851 4°F
Carlton 59833 4°F

Sizes certified to cover a typical house at −9°F

The size calculator uses 22 to 38 Btu/h per square foot for a typical house where the design temperature is below 0°F. Below 5°F the certified data has no figure. Sizes are compared on the 5°F full-speed test.

For each type: the smallest size class whose median model is certified to deliver the bottom of the range at 5°F, and the smallest that reaches the top. The medians count one value per model. Size classes are named by cooling capacity.

1,500 sq ft: 33,000 to 57,000 Btu/h

2,500 sq ft: 55,000 to 95,000 Btu/h

No single size class has a median model certified for 55,000 Btu/h at 5°F. A load this size is normally met by more than one system, or by zones.

Your own house

6,618 of 8,420 certified units carry EPA's cold-climate designation. Cold-climate heat pumps by size

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