Will a heat pump pay off in Castle Rock, CO?

Castle Rock is a place where a heat pump genuinely costs more to operate than the alternative. $3,500 is what Castle Rock would pay extra to go electric rather than replace the furnace and AC with the same again, once the $2,000 federal credit is applied. The heat pump would cost about $199 more a year to run than the furnace it replaces — a premium with no payback. That's Castle Rock's own climate and rates talking, not a hedge or a caveat.

Castle Rock's weather, in the numbers that matter

Castle Rock has a cold winter that leans hard on heating equipment — 5280 heating degree days a year against a 65°F base — and summers add a moderate cooling load, at 919 cooling degree days. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is -8°F, against a record low of -9.9°F. That puts the seasonal coefficient of performance at 2.51 for the recommended cold-climate unit. Below the 25°F line where a standard machine starts leaning on resistance backup, Castle Rock sits firmly in cold-climate territory, so that's the class of unit priced here. Climate figures trace to the nearest NOAA station, CENTENNIAL AIRPORT, 13.4 miles from Castle Rock.

The month-to-month numbers for Castle Rock

Modelled on a typical 2000-square-foot house, the heat pump draws about 5,327 kWh a year to keep it warm, plus cooling, for a combined electric bill near $1,010 a year. Castle Rock's gas rate of 11.17 per Mcf, applied to the 55 Mcf a year the furnace burns, puts its running cost near $811 a year, against 16.53¢ per kWh for electricity. Looked at as a full purchase rather than an incremental one, payback here is longer than the 15-year equipment life, leaving the 15-year total $6,483 behind.

If your home heats with electric baseboard instead of gas

Not every home in Castle Rock has gas service. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. Switching saves about $1,397 a year here — a heat pump moving heat rather than generating it needs far less electricity than resistance coils — so the extra $8,000 spent up front comes back in about 5.7 years.

Castle Rock against the rest of the country

Ranked against the other 3206 cities covered, Castle Rock comes in at 509 for heating severity — 1 would be the coldest place in the dataset — and 441 by population, where 1 is largest. That's the coldest third of the dataset, where climate does most of the work behind this figure.

Next step for 83,213 people in Castle Rock

Castle Rock, Colorado is home to about 83,213 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 Castle Rock, nothing is lost by holding off until the current equipment genuinely fails.

Ask a local HVAC contractor for a quote before committing either way.

Reading further on this page's numbers

The methodology guide walks through exactly how Castle Rock's 2.51 seasonal COP and the rest of this page's numbers get built. Castle Rock's -8°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.