Heat Pump Payback in Decatur, GA
Should Decatur switch to a heat pump?
The payback math works in Decatur on paper, past the equipment's own working life. Against a like-for-like gas furnace and AC swap, going electric costs $5,500 more up front here. Lower bills claw that back: about $344 saved annually, for a payback of roughly 16 years. That's a technicality, not a recommendation, for anyone actually living in Decatur.
Compare against another city
Landed on Decatur by mistake, or want to compare it against somewhere else? Search the other 3206 cities below.
How cold Decatur actually gets
Decatur has a mild winter by US standards, 2569 heating degree days a year against a 65°F base, and summers are hot enough that cooling matters as much as heating, at 1846 cooling degree days. 12°F is the figure equipment gets sized against here, the 99th-percentile cold snap, not an average day, with a low of 10.9°F in the 2024 station record. Worked through the model, that's a seasonal COP of 2.99 on the cold-climate unit fit for this climate. Mild on average, but the occasional cold snap is what sizes the equipment: at a 12°F design temperature Decatur falls just under the 25°F line where a standard heat pump starts leaning on resistance backup, so the model prices a cold-climate unit to be safe. These numbers come from Dekalb-Peachtree Airport, the closest NOAA station, 7.2 miles out.
Decatur's running-cost comparison, in dollars
Modelled on a typical 2000-square-foot house, the heat pump draws about 2,176 kWh a year to keep it warm, plus cooling, for a combined electric bill near $559 a year. The gas furnace it replaces burns roughly 27 Mcf a year at $20.42 per Mcf here, for a running cost near $903 a year including the old AC (electricity here runs 14.90¢/kWh). If the current system still worked and you replaced it anyway, the full cost would take longer than the 15-year equipment life to earn back; against buying a new furnace and AC regardless, the 15-year total lands $338 behind.
The break-even point in Decatur
Gas would only overtake the heat pump in Decatur if electricity rose past 40.3¢/kWh from 14.90¢, or gas fell under $7.56 per Mcf from $20.42. A useful quote test for Decatur: the heat pump is worth it within a decade if it costs less than $3,440 more than replacing the furnace and AC, and within 7 years if the gap is under $2,408.
The other scenario: no gas furnace to begin with
Plenty of homes in Decatur heat with electricity alone, no gas line involved. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. About $767 a year comes back this way, enough that the 13-year payback clears the $10,000 premium comfortably within the equipment's life.
Where Decatur ranks in this dataset
Ranked against the other 3206 cities covered, Decatur comes in at 2112 for heating severity, 1 would be the coldest place in the dataset, and 1638 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 Decatur
Decatur, Georgia is home to about 24,482 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 Decatur, nothing is lost by holding off until the current equipment genuinely fails.
Ask a local HVAC contractor for a quote before committing either way.
More on how this number was built
The methodology guide walks through exactly how Decatur's 2.99 seasonal COP and the rest of this page's numbers get built. At a 12°F design temperature, Decatur sits in cold-climate territory; the guide to that class of unit explains why.