Heat Pump Payback in Shelbyville, IN
Should Shelbyville switch to a heat pump?
Shelbyville is a place where a heat pump genuinely costs more to operate than the alternative. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $5,500. Running costs here land $48 a year higher than the furnace it replaces, so that premium is never recovered. That's Shelbyville's own climate and rates talking, not a hedge or a caveat.
Not the city you meant?
This runs the same numbers for 3206 US cities, not just Shelbyville. Look one up here.
Shelbyville's weather, in the numbers that matter
Degree days tell the story here: Shelbyville racks up 3914 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 1441 cooling degree days on the cooling side. 0°F is the figure equipment gets sized against here, the 99th-percentile cold snap, not an average day, with a low of -4°F in the 2024 station record. Worked through the model, that's a seasonal COP of 2.7 on the cold-climate unit fit for this climate. Shelbyville 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 Shelbyville Minucipal Airport, the closest NOAA station, 2.6 miles out.
The yearly running costs in Shelbyville
Modelled on a typical 2000-square-foot house, the heat pump draws about 3,671 kWh a year to keep it warm, plus cooling, for a combined electric bill near $834 a year. The gas furnace it replaces burns roughly 41 Mcf a year at $11.49 per Mcf here, for a running cost near $786 a year including the old AC (electricity here runs 17.03¢/kWh). Because the heat pump costs more to run here, the gap only widens with time: $6,219 behind after 15 years compared with replacing the furnace and AC like-for-like.
How sensitive Shelbyville's result is to prices
For the verdict in Shelbyville to flip, electricity would need to drop to about 15.4¢/kWh from 17.03¢, or gas climb past $12.67 per Mcf from $11.49. 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 Shelbyville; the case for one here rests on comfort, cooling, or replacing electric heat instead.
If your home heats with electric baseboard instead of gas
Not every home in Shelbyville has gas service. Swap the comparison to resistance heat instead of gas, and Shelbyville's answer improves. About $1,171 a year comes back this way, enough that the 8.5-year payback clears the $10,000 premium comfortably within the equipment's life.
Where Shelbyville ranks in this dataset
Shelbyville lands at position 1580 out of 3206 cities on heating severity (coldest is 1), and 1855 out of 3206 by population size (biggest is 1). That's the middle third for winter severity among the cities covered here.
Next step if you live in Shelbyville
Shelbyville, Indiana is home to about 20,845 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 Shelbyville, nothing is lost by holding off until the current equipment genuinely fails.
Line up a few local HVAC quotes before you decide.
Where Shelbyville's figure comes from
Every constant behind this page, the 2.7 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. At a 0°F design temperature, Shelbyville sits in cold-climate territory; the guide to that class of unit explains why.