La Grange, IL: the heat pump payback math
Here in La Grange, 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). Running costs here land $151 a year HIGHER than the furnace it replaces, so that premium is never recovered. There's no spin on that: La Grange's numbers say wait.
The climate behind La Grange's payback figure
Degree days tell the story here: La Grange 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. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 1.9°F, against a record low of -9°F. That puts the seasonal coefficient of performance at 2.75 for the recommended cold-climate unit. La Grange 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 CHICAGO MIDWAY INTL ARPT, 6.5 miles from La Grange — the closest one on record.
The month-to-month numbers for La Grange
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. That compares with roughly 47 Mcf a year of gas at La Grange's 11.25 per-Mcf rate — about $865 a year — against a local electricity rate of 19.06¢/kWh. Buy it outright, not incrementally, and payback stretches to beyond the 15-year equipment life; over 15 years the net position sits $5,767 behind.
If your home heats with electric baseboard instead of gas
Gas isn't universal in La Grange — many houses run on electric heat already. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. The saving here runs about $1,509 a year, which recovers the extra $8,000 spent going electric in roughly 5.3 years.
Where La Grange ranks in this dataset
La Grange lands at position 1161 out of 3206 cities on heating severity (coldest is 1), and 2302 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 La Grange
About 15,943 people live in La Grange, 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.
Reading further on this page's numbers
Nothing above is a black box: the methodology guide shows the full arithmetic behind La Grange's 2.75 seasonal COP and payback figure. La Grange's 1.9°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.