Is a heat pump worth it in Greenfield?
Here in Greenfield, 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 $3,500 more up front here (already netting out a $2,000 tax credit). The heat pump would cost about $298 more a year to run than the furnace it replaces — a premium with no payback. There's no spin on that: Greenfield's numbers say wait.
The climate behind Greenfield's payback figure
5229 heating degree days pile up here every year, so Greenfield has a cold winter that leans hard on heating equipment; the cooling side runs to 806 cooling degree days, where summers add a moderate cooling load. -2.9°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of -5.1°F on file. Worked through the model, that's a seasonal COP of 2.63 on the cold-climate unit fit for this climate. A cold-climate unit is the right call in Greenfield — 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, GENERAL MITCHELL INTERNATIONA, 5.1 miles from Greenfield.
Greenfield's running-cost comparison, in dollars
Modelled on a typical 2000-square-foot house, the heat pump draws about 5,034 kWh a year to keep it warm, plus cooling, for a combined electric bill near $1,080 a year. That compares with roughly 54 Mcf a year of gas at Greenfield's 10.74 per-Mcf rate — about $782 a year — against a local electricity rate of 18.87¢/kWh. Looked at as a full purchase rather than an incremental one, payback here is longer than the 15-year equipment life, leaving the 15-year total $7,965 behind.
Electric resistance heat in Greenfield, compared
Gas isn't universal in Greenfield — many houses run on electric heat already. Against electric-resistance heat — baseboard or an electric furnace, both 100% efficient but still just resistance — the case for switching gets stronger here. About $1,616 a year comes back this way, enough that the 5-year payback clears the $8,000 premium comfortably within the equipment's life.
How Greenfield compares nationally
Greenfield lands at position 541 out of 3206 cities on heating severity (coldest is 1), and 1116 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 for 37,232 people in Greenfield
About 37,232 people live in Greenfield, Wisconsin, 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.
More on how this number was built
Nothing above is a black box: the methodology guide shows the full arithmetic behind Greenfield's 2.63 seasonal COP and payback figure. Greenfield's -2.9°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.