Heat Pump Payback in Wilmington, DE
Wilmington, DE: the heat pump payback math
Wilmington 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. Wilmington's residents would see roughly $164 a year back in running costs, putting the payback around 33.6 years. Wilmington's own numbers say this pencils out only in theory, not in practice.
Checking a different city
Wilmington is one of 3206 cities covered here, each run through the same model. Search another below.
Why Wilmington's climate drives this number
Wilmington has a real but manageable winter, 4086 heating degree days a year against a 65°F base, and summers are hot enough that cooling matters as much as heating, at 1272 cooling degree days. The 99% winter design temperature here, the cold snap equipment must be sized for, not the seasonal average, is 10°F, and the coldest daily reading in the 2024 station record was 9°F. That puts the seasonal coefficient of performance at 2.94 for the recommended cold-climate unit. Wilmington needs the cold-climate class of unit: past a 25°F design temperature a standard heat pump falls back on resistance backup often enough to eat the savings. Source: NOAA station New Castle County Airport, 5.8 miles from Wilmington, the closest one on record.
Wilmington's running-cost comparison, in dollars
A 2000-square-foot house here would pull roughly 3,519 heating kilowatt-hours annually on top of cooling, totalling about $803 a year on electricity. That compares with roughly 43 Mcf a year of gas at Wilmington's $15.97 per-Mcf rate, about $967 a year with the old AC included, against a local electricity rate of 17.45¢/kWh. Buying outright rather than at replacement time stretches payback to longer than the 15-year equipment life. Over 15 years, compared with a like-for-like replacement, the heat pump leaves you $3,041 behind.
How sensitive Wilmington's result is to prices
This result holds unless electricity climbs above 23.0¢/kWh (it is 17.45¢ now) or gas drops below $12.12 per Mcf (now $15.97); past either point, gas becomes the cheaper fuel in Wilmington. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $164 a year saved, a difference under $1,148 pays back within 7 years here, and under $1,640 within 10.
The other scenario: no gas furnace to begin with
Gas isn't universal in Wilmington, 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. The saving here runs about $1,290 a year, which recovers the extra $10,000 spent going electric in roughly 7.8 years.
Wilmington against the rest of the country
Ranked against the other 3206 cities covered, Wilmington comes in at 1460 for heating severity, 1 would be the coldest place in the dataset, and 526 by population, where 1 is largest. That's the middle third for winter severity among the cities covered here.
Deciding what's next in Wilmington, DE
About 73,176 people live in Wilmington, Delaware, 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.
Where Wilmington's figure comes from
The methodology guide walks through exactly how Wilmington's 2.94 seasonal COP and the rest of this page's numbers get built. Wilmington's 10°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.