Heat Pump Payback in New Lenox, IL
Heat pump vs. gas furnace in New Lenox, IL
New Lenox is a place where a heat pump genuinely costs more to operate than the alternative. $5,500 is what New Lenox would pay extra to go electric rather than replace the furnace and AC with the same again. Running costs here land $250 a year higher than the furnace it replaces, so that premium is never recovered. That's New Lenox's own climate and rates talking, not a hedge or a caveat.
Checking a different city
This runs the same numbers for 3206 US cities, not just New Lenox. Look one up here.
New Lenox's weather, in the numbers that matter
New Lenox has a real but manageable winter, 4951 heating degree days a year against a 65°F base, and summers are hot enough that cooling matters as much as heating, at 1049 cooling degree days. -4°F is the figure equipment gets sized against here, the 99th-percentile cold snap, not an average day, with a low of -13°F in the 2024 station record. Worked through the model, that's a seasonal COP of 2.6 on the cold-climate unit fit for this climate. Below the 25°F line where a standard machine starts leaning on resistance backup, New Lenox sits firmly in cold-climate territory, so that's the class of unit priced here. These numbers come from Lewis University Airport, the closest NOAA station, 8.8 miles out.
What it actually costs to run, year to year
Modelled on a typical 2000-square-foot house, the heat pump draws about 4,822 kWh a year to keep it warm, plus cooling, for a combined electric bill near $1,090 a year. The gas furnace it replaces burns roughly 52 Mcf a year at $11.25 per Mcf here, for a running cost near $839 a year including the old AC (electricity here runs 19.06¢/kWh). Because the heat pump costs more to run here, the gap only widens with time: $9,254 behind after 15 years compared with replacing the furnace and AC like-for-like.
How sensitive New Lenox's result is to prices
For the verdict in New Lenox to flip, electricity would need to drop to about 13.3¢/kWh from 19.06¢, or gas climb past $16.10 per Mcf from $11.25. A utility offering a lower heat pump rate can change this. Until then, no quote price makes a heat pump pay back against gas in New Lenox; the case for one here rests on comfort, cooling, or replacing electric heat instead.
Electric resistance heat in New Lenox, compared
Not every home in New Lenox has gas service. Swap the comparison to resistance heat instead of gas, and New Lenox's answer improves. About $1,559 a year comes back this way, enough that the 6.4-year payback clears the $10,000 premium comfortably within the equipment's life.
How New Lenox compares nationally
Among 3206 cities, New Lenox's winter puts it at rank 808 for severity, while its size puts it at rank 1407 for population, 1 in both cases being the extreme. That's the coldest third of the dataset, where climate does most of the work behind this figure.
Next step if you live in New Lenox
New Lenox, Illinois is home to about 28,480 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 New Lenox, nothing is lost by holding off until the current equipment genuinely fails.
Get quotes from local HVAC contractors before deciding.
Reading further on this page's numbers
Every constant behind this page, the 2.6 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. At a -4°F design temperature, New Lenox sits in cold-climate territory; the guide to that class of unit explains why.