Forest Park, IL: the heat pump payback math
Here in Forest Park, the honest answer is that a heat pump raises your annual running cost. Against a like-for-like gas furnace and AC swap, going electric costs $3,500 more up front here (already netting out a $2,000 tax credit). Unfortunately the electric bill outweighs the gas bill it replaces by about $151 a year here, so the extra spend stays unrecovered. There's no spin on that: Forest Park's numbers say wait.
The climate behind Forest Park's payback figure
Degree days tell the story here: Forest Park racks up 4543 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 1348 cooling degree days on the cooling side. 1.9°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of -9°F on file. Worked through the model, that's a seasonal COP of 2.75 on the cold-climate unit fit for this climate. A cold-climate unit is the right call in Forest Park — 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 INTL ARPT, 6.6 miles from Forest Park.
The month-to-month numbers for Forest Park
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. The gas furnace it replaces burns roughly 47 Mcf a year at 11.25 per Mcf here, for a running cost near $865 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 $5,767 behind.
Electric resistance heat in Forest Park, compared
Plenty of homes in Forest Park 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 $1,509 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 5.3 years.
How Forest Park compares nationally
Forest Park lands at position 1165 out of 3206 cities on heating severity (coldest is 1), and 2538 out of 3206 by population size (biggest is 1). That's the middle third for winter severity among the cities covered here.
What to do with this number in Forest Park
About 13,846 people live in Forest Park, 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.
More on how this number was built
Nothing above is a black box: the methodology guide shows the full arithmetic behind Forest Park's 2.75 seasonal COP and payback figure. Forest Park'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.