What the cold here does to a heat pump
Your winter low here averages 19°F, and that's the number that decides this. A standard heat pump starts losing heat output below 40°F, and below about 35°F it usually needs backup heat to keep up. Pueblo County's average night is below both marks. This isn't a rare cold snap you're planning around. It's most nights, all winter.
Of the roughly 245 nights your heat runs each year here, about 155 drop to freezing or below. That's over half the heating season spent below the point where a standard heat pump is already working harder than its rating suggests. Only about 5 nights a year hit 0°F, so the deep cold is rare. The ordinary cold isn't.
There's a real fix for this: heat pumps built and tested for cold climates hold onto far more of their capacity at low temperatures, and in field testing, homes with these units needed backup heat for only a small share of the hours between 0°F and 35°Field, and almost never ran on backup alone above 0°F. A standard heat pump sized to the federal minimum doesn't carry that rating. If you're looking at a heat pump here, which one it is matters more than the fact that it's a heat pump.











