Heat Pump Payback in Alton, IL
Will a heat pump pay off in Alton, IL?
Here in Alton, the honest answer is that a heat pump raises your annual running cost. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $5,500. Unfortunately the electric bill outweighs the gas bill it replaces by about $129 a year here, so the extra spend stays unrecovered. There's no spin on that: Alton's numbers say wait.
Checking a different city
Alton is one of 3206 cities covered here, each run through the same model. Search another below.
Why Alton's climate drives this number
4026 heating degree days pile up here every year, so Alton has a real but manageable winter; the cooling side runs to 1319 cooling degree days, where summers are hot enough that cooling matters as much as heating. 1.2°F is the figure equipment gets sized against here, the 99th-percentile cold snap, not an average day, with a low of -7.6°F in the 2024 station record. Worked through the model, that's a seasonal COP of 2.73 on the cold-climate unit fit for this climate. Alton 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 St Louis Regional Airport, the closest NOAA station, 5.6 miles out.
Alton's running-cost comparison, in dollars
Electricity use for heating alone comes out to about 3,734 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $926 a year. The gas furnace it replaces burns roughly 42 Mcf a year at $11.25 per Mcf here, for a running cost near $798 a year including the old AC (electricity here runs 19.06¢/kWh). With running costs higher every year, there is no payback at any purchase price; over 15 years, against a like-for-like replacement, a household here would end $7,429 behind.
How sensitive Alton's result is to prices
The heat pump would become the cheaper option in Alton if electricity fell to 15.0¢/kWh (from 19.06¢) or gas rose above $14.32 per Mcf (from $11.25). At today's prices a cheaper quote cannot rescue the gas comparison in Alton, since there is no yearly saving to recover it from.
If your home heats with electric baseboard instead of gas
Plenty of homes in Alton heat with electricity alone, no gas line involved. Swap the comparison to resistance heat instead of gas, and Alton's answer improves. About $1,343 a year comes back this way, enough that the 7.4-year payback clears the $10,000 premium comfortably within the equipment's life.
How Alton compares nationally
Ranked against the other 3206 cities covered, Alton comes in at 1488 for heating severity, 1 would be the coldest place in the dataset, and 1608 by population, where 1 is largest. That's the middle third for winter severity among the cities covered here.
Next step if you live in Alton
About 24,967 people live in Alton, 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.
Where Alton's figure comes from
Every constant behind this page, the 2.73 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. At a 1.2°F design temperature, Alton sits in cold-climate territory; the guide to that class of unit explains why.