Heat pump vs. gas furnace in Lewiston, ME
Here in Lewiston, the honest answer is that a heat pump raises your annual running cost. $3,500 is what Lewiston 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. Running costs here land $475 a year HIGHER than the furnace it replaces, so that premium is never recovered. There's no spin on that: Lewiston's numbers say wait.
Why Lewiston's climate drives this number
Degree days tell the story here: Lewiston racks up 6483 heating degree days each year (base 65°F), and summers add a moderate cooling load, with 384 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: 0°F here (record low -0.9°F), which works out to a seasonal COP of 2.7 for the cold-climate class of unit this climate calls for. Below the 25°F line where a standard machine starts leaning on resistance backup, Lewiston sits firmly in cold-climate territory, so that's the class of unit priced here. Climate figures trace to the nearest NOAA station, AUBURN/LEWISTON MUNI ARPT, 6.1 miles from Lewiston.
What it actually costs to run, year to year
Modelled on a typical 2000-square-foot house, the heat pump draws about 6,080 kWh a year to keep it warm, plus cooling, for a combined electric bill near $1,902 a year. That compares with roughly 68 Mcf a year of gas at Lewiston's 18.95 per-Mcf rate — about $1,427 a year — against a local electricity rate of 29.68¢/kWh. Buy it outright, not incrementally, and payback stretches to beyond the 15-year equipment life; over 15 years the net position sits $10,618 behind.
The other scenario: no gas furnace to begin with
Gas isn't universal in Lewiston — many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Lewiston's answer improves. About $3,118 a year comes back this way, enough that the 2.6-year payback clears the $8,000 premium comfortably within the equipment's life.
Lewiston against the rest of the country
Lewiston lands at position 91 out of 3206 cities on heating severity (coldest is 1), and 1065 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.
Deciding what's next in Lewiston, ME
About 38,772 people live in Lewiston, Maine, 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.
More on how this number was built
The methodology guide walks through exactly how Lewiston's 2.7 seasonal COP and the rest of this page's numbers get built. Lewiston's 0°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.