Heat Pump Payback in Missoula, MT
Missoula, MT: the heat pump payback math
Missoula is a place where a heat pump genuinely costs more to operate than the alternative. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $5,500. The heat pump would cost about $357 more a year to run than the furnace it replaces, a premium with no payback. That's Missoula's own climate and rates talking, not a hedge or a caveat.
Compare against another city
This runs the same numbers for 3206 US cities, not just Missoula. Look one up here.
How cold Missoula actually gets
Missoula has a cold winter that leans hard on heating equipment, 6930 heating degree days a year against a 65°F base, and summers add a moderate cooling load, at 470 cooling degree days. The 99% winter design temperature here, the cold snap equipment must be sized for, not the seasonal average, is -17°F, and the coldest daily reading in the 2024 station record was -22°F. That puts the seasonal coefficient of performance at 2.3 for the recommended cold-climate unit. Below the 25°F line where a standard machine starts leaning on resistance backup, Missoula sits firmly in cold-climate territory, so that's the class of unit priced here. Climate figures trace to the nearest NOAA station, Missoula International Airpor, 4.5 miles from Missoula.
Missoula's running-cost comparison, in dollars
Electricity use for heating alone comes out to about 7,629 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $1,089 a year. That compares with roughly 72 Mcf a year of gas at Missoula's $8.99 per-Mcf rate, about $731 a year with the old AC included, against a local electricity rate of 13.56¢/kWh. Because the heat pump costs more to run here, the gap only widens with time: $10,862 behind after 15 years compared with replacing the furnace and AC like-for-like.
The break-even point in Missoula
For the verdict in Missoula to flip, electricity would need to drop to about 8.7¢/kWh from 13.56¢, or gas climb past $13.94 per Mcf from $8.99. 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 Missoula; the case for one here rests on comfort, cooling, or replacing electric heat instead.
If your home heats with electric baseboard instead of gas
Gas isn't universal in Missoula, many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Missoula's answer improves. About $1,373 a year comes back this way, enough that the 7.3-year payback clears the $10,000 premium comfortably within the equipment's life.
Missoula against the rest of the country
Missoula lands at position 51 out of 3206 cities on heating severity (coldest is 1), and 483 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.
What to do with this number in Missoula
Missoula, Montana is home to about 78,204 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 Missoula, nothing is lost by holding off until the current equipment genuinely fails.
Get quotes from local HVAC contractors before deciding.
Reading further on this page's numbers
Nothing above is a black box: the methodology guide shows the full arithmetic behind Missoula's 2.3 seasonal COP and payback figure. At a -17°F design temperature, Missoula sits in cold-climate territory; the guide to that class of unit explains why.