Heat Pump Payback in Rapid City, SD
Heat pump vs. gas furnace in Rapid City, SD
Here in Rapid City, the honest answer is that a heat pump raises your annual running cost. Against a like-for-like gas furnace and AC swap, going electric costs $5,500 more up front here. Unfortunately the electric bill outweighs the gas bill it replaces by about $235 a year here, so the extra spend stays unrecovered. There's no spin on that: Rapid City's numbers say wait.
Compare against another city
Landed on Rapid City by mistake, or want to compare it against somewhere else? Search the other 3206 cities below.
Why Rapid City's climate drives this number
6176 heating degree days pile up here every year, so Rapid City has a cold winter that leans hard on heating equipment; the cooling side runs to 959 cooling degree days, where summers add a moderate cooling load. Sizing runs off the design temperature, not the average day: -13.5°F here (coldest 2024 reading -23.1°F), which works out to a seasonal COP of 2.38 for the cold-climate class of unit this climate calls for. Rapid City needs the cold-climate class of unit: past a 25°F design temperature a standard heat pump falls back on resistance backup often enough to eat the savings. Source: NOAA station Ellsworth Air Force Base, 8 miles from Rapid City, the closest one on record.
What it actually costs to run, year to year
A 2000-square-foot house here would pull roughly 6,571 heating kilowatt-hours annually on top of cooling, totalling about $1,045 a year on electricity. Rapid City's gas rate of $9.86 per Mcf, applied to the 64 Mcf a year the furnace burns, puts the current furnace-and-AC running cost near $810 a year, against 14.15¢ per kWh for electricity. With running costs higher every year, there is no payback at any purchase price; over 15 years, against a like-for-like replacement, a household here would end $9,031 behind.
How sensitive Rapid City's result is to prices
The heat pump would become the cheaper option in Rapid City if electricity fell to 10.3¢/kWh (from 14.15¢) or gas rose above $13.52 per Mcf (from $9.86). At today's prices a cheaper quote cannot rescue the gas comparison in Rapid City, since there is no yearly saving to recover it from.
If your home heats with electric baseboard instead of gas
Not every home in Rapid City has gas service. Swap the comparison to resistance heat instead of gas, and Rapid City's answer improves. About $1,343 a year comes back this way, enough that the 7.4-year payback clears the $10,000 premium comfortably within the equipment's life.
How Rapid City compares nationally
Rapid City lands at position 163 out of 3206 cities on heating severity (coldest is 1), and 465 out of 3206 by population size (biggest is 1). That's the coldest third of the dataset, where climate does most of the work behind this figure.
Next step if you live in Rapid City
About 79,894 people live in Rapid City, South Dakota, and every number on this page is what a contractor would actually work from when quoting a system here, the point isn't to replace that quote, it's to tell you whether to bother asking for one. Here, there's no cost penalty to waiting until your current furnace or AC actually needs replacing.
Ask a local HVAC contractor for a quote before committing either way.
Reading further on this page's numbers
Nothing above is a black box: the methodology guide shows the full arithmetic behind Rapid City's 2.38 seasonal COP and payback figure. Rapid City's -13.5°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.