Heat pump vs. gas furnace in St. Matthews, KY
St. Matthews 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 $3,500 after a $2,000 federal tax credit. St. Matthews's residents would see roughly $162 a year back in running costs, putting the payback around 21.6 years. St. Matthews's own numbers say this pencils out only in theory, not in practice.
Why St. Matthews's climate drives this number
Degree days tell the story here: St. Matthews racks up 3632 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 1460 cooling degree days on the cooling side. 5°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 1.9°F on file. Worked through the model, that's a seasonal COP of 2.82 on the cold-climate unit fit for this climate. Below the 25°F line where a standard machine starts leaning on resistance backup, St. Matthews sits firmly in cold-climate territory, so that's the class of unit priced here. These numbers come from BOWMAN FIELD AIRPORT, the closest NOAA station, 2 miles out.
St. Matthews's running-cost comparison, in dollars
Modelled on a typical 2000-square-foot house, the heat pump draws about 3,261 kWh a year to keep it warm, plus cooling, for a combined electric bill near $648 a year. The gas furnace it replaces burns roughly 38 Mcf a year at 14.23 per Mcf here, for a running cost near $811 a year (electricity here runs 14.39¢/kWh). Looked at as a full purchase rather than an incremental one, payback here is roughly 83.3 years, leaving the 15-year total $1,068 behind.
The other scenario: no gas furnace to begin with
Gas isn't universal in St. Matthews — many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and St. Matthews's answer improves. About $947 a year comes back this way, enough that the 8.4-year payback clears the $8,000 premium comfortably within the equipment's life.
Where St. Matthews ranks in this dataset
Among 3206 cities, St. Matthews's winter puts it at rank 1728 for severity, while its size puts it at rank 2115 for population — 1 in both cases being the extreme. That's the middle third for winter severity among the cities covered here.
Next step for 17,806 people in St. Matthews
About 17,806 people live in St. Matthews, Kentucky, 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.
Line up a few local HVAC quotes before you decide.
More on how this number was built
The methodology guide walks through exactly how St. Matthews's 2.82 seasonal COP and the rest of this page's numbers get built. St. Matthews's 5°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.