Waukegan, IL: the heat pump payback math
Here in Waukegan, the honest answer is that a heat pump raises your annual running cost. $3,500 is what Waukegan 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. That's Waukegan's own climate and rates talking, not a hedge or a caveat.
How cold Waukegan actually gets
5324 heating degree days pile up here every year, so Waukegan has a cold winter that leans hard on heating equipment; the cooling side runs to 777 cooling degree days, where summers add a moderate cooling load. -0.9°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of -11°F on file. Worked through the model, that's a seasonal COP of 2.68 on the cold-climate unit fit for this climate. Below the 25°F line where a standard machine starts leaning on resistance backup, Waukegan sits firmly in cold-climate territory, so that's the class of unit priced here. Source: NOAA station WAUKEGAN REGIONAL AIRPORT, 3.3 miles from Waukegan — the closest one on record.
Waukegan's running-cost comparison, in dollars
Modelled on a typical 2000-square-foot house, the heat pump draws about 5,030 kWh a year to keep it warm, plus cooling, for a combined 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). 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 $7,540 behind.
The other scenario: no gas furnace to begin with
Plenty of homes in Waukegan heat with electricity alone, no gas line involved. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. About $1,676 a year comes back this way, enough that the 4.8-year payback clears the $8,000 premium comfortably within the equipment's life.
Where Waukegan ranks in this dataset
Ranked against the other 3206 cities covered, Waukegan comes in at 460 for heating severity — 1 would be the coldest place in the dataset — and 404 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 Waukegan
Waukegan, Illinois is home to about 88,570 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 Waukegan, 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
Nothing above is a black box: the methodology guide shows the full arithmetic behind Waukegan's 2.68 seasonal COP and payback figure. Waukegan's -0.9°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.