Cold-climate heat pumps for Idaho
Across the 280 ZIP-code areas in Idaho, the winter design temperature runs from −2°F to 16°F for most areas, with a median of 11°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 Idaho
| Design temperature | Areas | Share |
|---|---|---|
| Below 5°FNo certified heating figure | 82 | 29.3% |
| 5 to 17°F | 185 | 66.1% |
| 17 to 47°F | 13 | 4.6% |
| 47°F and above | 0 | 0% |
| Place | ZIP code | Design temperature |
|---|---|---|
| Island Park | 83429 | −11°F |
| Clayton | 83227 | −10°F |
| Fairfield | 83327 | −10°F |
| Place | ZIP code | Design temperature |
|---|---|---|
| Clearwater County | 83520 | 19°F |
| Culdesac | 83524 | 19°F |
| Genesee | 83832 | 19°F |
Sizes certified to cover a typical house at 11°F
The size calculator uses 18 to 30 Btu/h per square foot for a typical house where the design temperature is 0 to 19°F. 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: 27,0007.91 to 45,000 Btu/h13.19 kW
- 42,000 Btu central models33,000 Btu/h9.67 kW at 5°F, the median of 222 models · covers the bottom of the range
- All 5-ton models46,500 Btu/h13.63 kW at 5°F, the median of 34 models · covers the top of the range
- 36,000 Btu mini-split models31,000 Btu/h9.09 kW at 5°F, the median of 553 models · covers the bottom of the range
- 54,000 Btu mini-split models47,500 Btu/h13.92 kW at 5°F, the median of 115 models · covers the top of the range
2,500 sq ft: 45,00013.19 to 75,000 Btu/h21.98 kW
- All 5-ton models46,500 Btu/h13.63 kW at 5°F, the median of 34 models · covers the bottom of the range
- No central size class reaches 75,000 Btu/h21.98 kW at 5°FThe top of this range takes more than one unit
- 54,000 Btu mini-split models47,500 Btu/h13.92 kW at 5°F, the median of 115 models · covers the bottom of the range
- No mini-split size class reaches 75,000 Btu/h21.98 kW at 5°FThe top of this range takes more than one unit
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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