Heat Pump Payback in Medford, MA
Is a heat pump worth it in Medford?
In Medford, the extra upfront cost technically comes back, just not before the equipment wears out. Against a like-for-like gas furnace and AC swap, going electric costs $5,500 more up front here. Medford's residents would see roughly $177 a year back in running costs, putting the payback around 31.1 years. Medford'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 Medford. Look one up here.
Why Medford's climate drives this number
Degree days tell the story here: Medford racks up 4588 heating degree days each year (base 65°F), and summers add a moderate cooling load, with 874 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: 15.8°F here (coldest 2024 reading 11.7°F), which works out to a seasonal COP of 3.08 for the cold-climate class of unit this climate calls for. A cold-climate unit is the right call in Medford, below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. These numbers come from Boston, the closest NOAA station, 5.9 miles out.
Medford's running-cost comparison, in dollars
Modelled on a typical 2000-square-foot house, the heat pump draws about 3,772 kWh a year to keep it warm, plus cooling, for a combined electric bill near $1,362 a year. The gas furnace it replaces burns roughly 48 Mcf a year at $25.06 per Mcf here, for a running cost near $1,539 a year including the old AC (electricity here runs 30.15¢/kWh). If the current system still worked and you replaced it anyway, the full cost would take longer than the 15-year equipment life to earn back; against buying a new furnace and AC regardless, the 15-year total lands $2,844 behind.
What would change Medford's answer
This result holds unless electricity climbs above 35.4¢/kWh (it is 30.15¢ now) or gas drops below $21.35 per Mcf (now $25.06); past either point, gas becomes the cheaper fuel in Medford. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $177 a year saved, a difference under $1,239 pays back within 7 years here, and under $1,770 within 10.
The other scenario: no gas furnace to begin with
Gas isn't universal in Medford, many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Medford's answer improves. The saving here runs about $2,482 a year, which recovers the extra $10,000 spent going electric in roughly 4 years.
Where Medford ranks in this dataset
Ranked against the other 3206 cities covered, Medford comes in at 1106 for heating severity, 1 would be the coldest place in the dataset, and 673 by population, where 1 is largest. That's the middle third for winter severity among the cities covered here.
What to do with this number in Medford
About 59,898 people live in Medford, Massachusetts, 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.
Get quotes from local HVAC contractors before deciding.
Reading further on this page's numbers
The methodology guide walks through exactly how Medford's 3.08 seasonal COP and the rest of this page's numbers get built. Medford's 15.8°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.