Bolingbrook, IL: the heat pump payback math
Here in Bolingbrook, the honest answer is that a heat pump raises your annual running cost. $3,500 is what Bolingbrook would pay extra to go electric rather than replace the furnace and AC with the same again, once the $2,000 federal credit is applied. The heat pump would cost about $250 more a year to run than the furnace it replaces — a premium with no payback. There's no spin on that: Bolingbrook's numbers say wait.
Why Bolingbrook's climate drives this number
4951 heating degree days pile up here every year, so Bolingbrook has a real but manageable winter; the cooling side runs to 1049 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 -4°F, against a record low of -13°F. That puts the seasonal coefficient of performance at 2.6 for the recommended cold-climate unit. Bolingbrook 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. These numbers come from LEWIS UNIVERSITY AIRPORT, the closest NOAA station, 5.9 miles out.
Bolingbrook's running-cost comparison, in dollars
Modelled on a typical 2000-square-foot house, the heat pump draws about 4,822 kWh a year to keep it warm, plus cooling, for a combined electric bill near $1,090 a year. That compares with roughly 52 Mcf a year of gas at Bolingbrook's 11.25 per-Mcf rate — about $839 a year — against a local electricity rate of 19.06¢/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 $7,254 behind.
If your home heats with electric baseboard instead of gas
Gas isn't universal in Bolingbrook — many houses run on electric heat already. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. About $1,559 a year comes back this way, enough that the 5.1-year payback clears the $8,000 premium comfortably within the equipment's life.
How Bolingbrook compares nationally
Bolingbrook lands at position 803 out of 3206 cities on heating severity (coldest is 1), and 515 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.
What to do with this number in Bolingbrook
About 74,756 people live in Bolingbrook, Illinois, 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 Bolingbrook's figure comes from
Every constant behind this page — the 2.6 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. Bolingbrook's -4°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.