Heat Pump Payback in Thornton, CO
Should Thornton switch to a heat pump?
Here in Thornton, the honest answer is that a heat pump raises your annual running cost. $5,500 is what Thornton would pay extra to go electric rather than replace the furnace and AC with the same again. Running costs here land $195 a year higher than the furnace it replaces, so that premium is never recovered. That's Thornton's own climate and rates talking, not a hedge or a caveat.
Checking a different city
This runs the same numbers for 3206 US cities, not just Thornton. Look one up here.
How cold Thornton actually gets
5528 heating degree days pile up here every year, so Thornton has a cold winter that leans hard on heating equipment; the cooling side runs to 852 cooling degree days, where summers add a moderate cooling load. The 99% winter design temperature here, the cold snap equipment must be sized for, not the seasonal average, is -5.4°F, and the coldest daily reading in the 2024 station record was -20.6°F. That puts the seasonal coefficient of performance at 2.57 for the recommended cold-climate unit. Below the 25°F line where a standard machine starts leaning on resistance backup, Thornton sits firmly in cold-climate territory, so that's the class of unit priced here. Source: NOAA station Erie Municipal Airport, 8.8 miles from Thornton, the closest one on record.
The yearly running costs in Thornton
Electricity use for heating alone comes out to about 5,447 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $1,020 a year. The gas furnace it replaces burns roughly 58 Mcf a year at $11.17 per Mcf here, for a running cost near $826 a year including the old AC (electricity here runs 16.53¢/kWh). Because the heat pump costs more to run here, the gap only widens with time: $8,422 behind after 15 years compared with replacing the furnace and AC like-for-like.
What would change Thornton's answer
For the verdict in Thornton to flip, electricity would need to drop to about 12.7¢/kWh from 16.53¢, or gas climb past $14.55 per Mcf from $11.17. A utility offering a lower heat pump rate can change this. Until then, no quote price makes a heat pump pay back against gas in Thornton; the case for one here rests on comfort, cooling, or replacing electric heat instead.
Electric resistance heat in Thornton, compared
Not every home in Thornton has gas service. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. The saving here runs about $1,476 a year, which recovers the extra $10,000 spent going electric in roughly 6.8 years.
Thornton against the rest of the country
Among 3206 cities, Thornton's winter puts it at rank 350 for severity, while its size puts it at rank 190 for population, 1 in both cases being the extreme. That's the coldest third of the dataset, where climate does most of the work behind this figure.
Deciding what's next in Thornton, CO
Thornton, Colorado is home to about 146,689 people, and the figures above are the same ones a local HVAC contractor uses to size and quote a system, this site doesn't guess where a real quote would land, it just tells you whether it's worth asking for one. In Thornton, nothing is lost by holding off until the current equipment genuinely fails.
Line up a few local HVAC quotes before you decide.
Reading further on this page's numbers
The methodology guide walks through exactly how Thornton's 2.57 seasonal COP and the rest of this page's numbers get built. Thornton's -5.4°F design temperature is below the 25°F line, which is why a cold-climate unit is the right call here, see what that changes in the cold-climate unit guide.