Zion, IL: the heat pump payback math
In Zion, a heat pump would cost more to run each year than what you have now. $3,500 is what Zion 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 $269 more a year to run than the furnace it replaces — a premium with no payback. There's no spin on that: Zion's numbers say wait.
Why Zion's climate drives this number
Zion has a cold winter that leans hard on heating equipment — 5324 heating degree days a year against a 65°F base — and summers add a moderate cooling load, at 777 cooling degree days. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is -0.9°F, against a record low of -11°F. That puts the seasonal coefficient of performance at 2.68 for the recommended cold-climate unit. Zion 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 WAUKEGAN REGIONAL AIRPORT, 3.1 miles from Zion — the closest one on record.
What it actually costs to run, year to year
Electricity use for heating alone comes out to about 5,030 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $1,085 a year. The gas furnace it replaces burns roughly 55 Mcf a year at 11.25 per Mcf here, for a running cost near $816 a year (electricity here runs 19.06¢/kWh). Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs past the 15-year equipment life, for a 15-year net position $7,540 behind.
If your home heats with electric baseboard instead of gas
Gas isn't universal in Zion — 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. Switching saves about $1,676 a year here — a heat pump moving heat rather than generating it needs far less electricity than resistance coils — so the extra $8,000 spent up front comes back in about 4.8 years.
How Zion compares nationally
Among 3206 cities, Zion's winter puts it at rank 466 for severity, while its size puts it at rank 1633 for population — 1 in both cases being the extreme. 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 Zion
About 24,583 people live in Zion, 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.
Line up a few local HVAC quotes before you decide.
Reading further on this page's numbers
Nothing above is a black box: the methodology guide shows the full arithmetic behind Zion's 2.68 seasonal COP and payback figure. Zion's -0.9°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.