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Cold-climate heat pumps for Iowa

Across the 970 ZIP-code areas in Iowa, the winter design temperature runs from −6°F to 1°F for most areas, with a median of −2°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 Iowa

ZIP-code areas in Iowa, by design temperature
Design temperature Areas Share
Below 5°FNo certified heating figure 970 100%
5 to 17°F 0 0%
17 to 47°F 0 0%
47°F and above 0 0%
Coldest areas in Iowa
Place ZIP code Design temperature
Chester 52134 −8°F
Lime Springs 52155 −8°F
Aredale 50605 −7°F
Warmest areas in Iowa
Place ZIP code Design temperature
Hamburg 51640 3°F
Percival 51648 3°F
Argyle 52619 3°F

Sizes certified to cover a typical house at −2°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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