Heat Pump Payback in Warrenville, IL
Heat pump vs. gas furnace in Warrenville, IL
Warrenville 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. Unfortunately the electric bill outweighs the gas bill it replaces by about $295 a year here, so the extra spend stays unrecovered. That's Warrenville's own climate and rates talking, not a hedge or a caveat.
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This runs the same numbers for 3206 US cities, not just Warrenville. Look one up here.
How cold Warrenville actually gets
Warrenville has a cold winter that leans hard on heating equipment, 5064 heating degree days a year against a 65°F base, and summers add a moderate cooling load, at 915 cooling degree days. Sizing runs off the design temperature, not the average day: -7.1°F here (coldest 2024 reading -14.1°F), which works out to a seasonal COP of 2.53 for the cold-climate class of unit this climate calls for. Warrenville 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 Dupage Airport, 7.1 miles from Warrenville, the closest one on record.
The yearly running costs in Warrenville
Modelled on a typical 2000-square-foot house, the heat pump draws about 5,068 kWh a year to keep it warm, plus cooling, for a combined electric bill near $1,115 a year. The gas furnace it replaces burns roughly 53 Mcf a year at $11.25 per Mcf here, for a running cost near $819 a year including the old AC (electricity here runs 19.06¢/kWh). Because the heat pump costs more to run here, the gap only widens with time: $9,930 behind after 15 years compared with replacing the furnace and AC like-for-like.
What would change Warrenville's answer
For the verdict in Warrenville to flip, electricity would need to drop to about 12.7¢/kWh from 19.06¢, or gas climb past $16.85 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 Warrenville; the case for one here rests on comfort, cooling, or replacing electric heat instead.
Electric resistance heat in Warrenville, compared
Plenty of homes in Warrenville heat with electricity alone, no gas line involved. Against electric-resistance heat, baseboard or an electric furnace, both 100% efficient but still just resistance, the case for switching gets stronger here. Switching saves about $1,555 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 6.4 years.
Warrenville against the rest of the country
Ranked against the other 3206 cities covered, Warrenville comes in at 641 for heating severity, 1 would be the coldest place in the dataset, and 2369 by population, where 1 is largest. That's the coldest third of the dataset, where climate does most of the work behind this figure.
What to do with this number in Warrenville
Warrenville, Illinois is home to about 15,247 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 Warrenville, nothing is lost by holding off until the current equipment genuinely fails.
Line up a few local HVAC quotes before you decide.
More on how this number was built
Every constant behind this page, the 2.53 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. Warrenville's -7.1°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.