Heat Pump Payback in Plum, PA
Heat pump vs. gas furnace in Plum, PA
Plum technically pencils out, but only past the point the equipment would need replacing anyway. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $5,500. Lower bills claw that back: about $17 saved annually, for a payback of roughly 323.1 years. Plum's own numbers say this pencils out only in theory, not in practice.
Not the city you meant?
This runs the same numbers for 3206 US cities, not just Plum. Look one up here.
Why Plum's climate drives this number
Degree days tell the story here: Plum racks up 4313 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 1220 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: 10°F here (coldest 2024 reading 8.1°F), which works out to a seasonal COP of 2.94 for the cold-climate class of unit this climate calls for. A cold-climate unit is the right call in Plum, below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. Climate figures trace to the nearest NOAA station, Allegheny County Airport, 13.7 miles from Plum.
The yearly running costs in Plum
Modelled on a typical 2000-square-foot house, the heat pump draws about 3,715 kWh a year to keep it warm, plus cooling, for a combined electric bill near $987 a year. Plum's gas rate of $15.04 per Mcf, applied to the 45 Mcf a year the furnace burns, puts the current furnace-and-AC running cost near $1,004 a year, against 20.75¢ per kWh for electricity. Priced as a standalone purchase, with a working furnace ripped out early, payback would take longer than the 15-year equipment life. Measured against the like-for-like replacement instead, a household here ends 15 years $5,245 behind.
How sensitive Plum's result is to prices
This result holds unless electricity climbs above 21.3¢/kWh (it is 20.75¢ now) or gas drops below $14.66 per Mcf (now $15.04); past either point, gas becomes the cheaper fuel in Plum. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $17 a year saved, a difference under $119 pays back within 7 years here, and under $170 within 10.
The other scenario: no gas furnace to begin with
Gas isn't universal in Plum, many houses run on electric heat already. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. Switching saves about $1,608 a year here, a heat pump moving heat rather than generating it needs far less electricity than resistance coils, so the extra $10,000 spent up front comes back in about 6.2 years.
How Plum compares nationally
Among 3206 cities, Plum's winter puts it at rank 1310 for severity, while its size puts it at rank 1513 for population, 1 in both cases being the extreme. That's the middle third for winter severity among the cities covered here.
Next step if you live in Plum
About 26,420 people live in Plum, Pennsylvania, 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
Every constant behind this page, the 2.94 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. Plum's 10°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.