Will a heat pump pay off in Herrin, IL?
In Herrin, a heat pump would cost more to run each year than what you have now. $3,500 is what Herrin 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. Running costs here land $80 a year HIGHER than the furnace it replaces, so that premium is never recovered. There's no spin on that: Herrin's numbers say wait.
Why Herrin's climate drives this number
Degree days tell the story here: Herrin racks up 3600 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 1463 cooling degree days on the cooling side. 3.2°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 1.2°F on file. Worked through the model, that's a seasonal COP of 2.78 on the cold-climate unit fit for this climate. A cold-climate unit is the right call in Herrin — 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, WILLIAMSON COUNTY RGNL APT, 3.7 miles from Herrin.
The month-to-month numbers for Herrin
A 2000-square-foot house here would pull roughly 3,279 heating kilowatt-hours annually on top of cooling, totalling about $863 a year on electricity. Herrin's gas rate of 11.25 per Mcf, applied to the 37 Mcf a year the furnace burns, puts its running cost near $783 a year, against 19.06¢ per kWh for electricity. 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 $4,693 behind.
Electric resistance heat in Herrin, compared
Not every home in Herrin has gas service. Swap the comparison to resistance heat instead of gas, and Herrin's answer improves. The saving here runs about $1,236 a year, which recovers the extra $8,000 spent going electric in roughly 6.5 years.
Herrin against the rest of the country
Among 3206 cities, Herrin's winter puts it at rank 1742 for severity, while its size puts it at rank 2777 for population — 1 in both cases being the extreme. That's the middle third for winter severity among the cities covered here.
Deciding what's next in Herrin, IL
About 12,253 people live in Herrin, 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.
Ask a local HVAC contractor for a quote before committing either way.
More on how this number was built
Nothing above is a black box: the methodology guide shows the full arithmetic behind Herrin's 2.78 seasonal COP and payback figure. At a 3.2°F design temperature, Herrin sits in cold-climate territory; the guide to that class of unit explains why.