Heat Pump Payback in Westmont, IL
Heat pump vs. gas furnace in Westmont, IL
Westmont is a place where a heat pump genuinely costs more to operate than the alternative. Against a like-for-like gas furnace and AC swap, going electric costs $5,500 more up front here. The heat pump would cost about $151 more a year to run than the furnace it replaces, a premium with no payback. That's Westmont's own climate and rates talking, not a hedge or a caveat.
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Westmont's weather, in the numbers that matter
4543 heating degree days pile up here every year, so Westmont has a real but manageable winter; the cooling side runs to 1348 cooling degree days, where summers are hot enough that cooling matters as much as heating. The 99% winter design temperature here, the cold snap equipment must be sized for, not the seasonal average, is 1.9°F, and the coldest daily reading in the 2024 station record was -9°F. That puts the seasonal coefficient of performance at 2.75 for the recommended cold-climate unit. A cold-climate unit is the right call in Westmont, 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, Chicago Midway International Airport, 11.4 miles from Westmont.
The yearly running costs in Westmont
Electricity use for heating alone comes out to about 4,183 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $1,016 a year. That compares with roughly 47 Mcf a year of gas at Westmont's $11.25 per-Mcf rate, about $865 a year with the old AC included, against a local electricity rate of 19.06¢/kWh. Because the heat pump costs more to run here, the gap only widens with time: $7,767 behind after 15 years compared with replacing the furnace and AC like-for-like.
How sensitive Westmont's result is to prices
For the verdict in Westmont to flip, electricity would need to drop to about 14.8¢/kWh from 19.06¢, or gas climb past $14.44 per Mcf from $11.25. A utility offering a lower heat pump rate can change this. Until then, no quote price makes a heat pump pay back against gas in Westmont; the case for one here rests on comfort, cooling, or replacing electric heat instead.
Electric resistance heat in Westmont, compared
Gas isn't universal in Westmont, 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 $1,509 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 6.6 years.
Westmont against the rest of the country
Among 3206 cities, Westmont's winter puts it at rank 1153 for severity, while its size puts it at rank 1649 for population, 1 in both cases being the extreme. That's the middle third for winter severity among the cities covered here.
What to do with this number in Westmont
Westmont, Illinois is home to about 24,308 people, and the figures above are the same ones a local HVAC contractor uses to size and quote a system, this site doesn't guess where a real quote would land, it just tells you whether it's worth asking for one. In Westmont, nothing is lost by holding off until the current equipment genuinely fails.
Get quotes from local HVAC contractors before deciding.
More on how this number was built
The methodology guide walks through exactly how Westmont's 2.75 seasonal COP and the rest of this page's numbers get built. Westmont's 1.9°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.