Heat Pump Payback in South Fulton, GA
South Fulton, GA: the heat pump payback math
The payback math works in South Fulton on paper, past the equipment's own working life. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $5,500. That premium is recovered through $339 of lower running costs every year, landing the payback clock at roughly 16.2 years. That's a technicality, not a recommendation, for anyone actually living in South Fulton.
Compare against another city
This runs the same numbers for 3206 US cities, not just South Fulton. Look one up here.
How cold South Fulton actually gets
South Fulton has a mild winter by US standards, 2093 heating degree days a year against a 65°F base, and summers are hot enough that cooling matters as much as heating, at 2333 cooling degree days. 14°F is the figure equipment gets sized against here, the 99th-percentile cold snap, not an average day, with a low of 12.9°F in the 2024 station record. Worked through the model, that's a seasonal COP of 3.04 on the cold-climate unit fit for this climate. Mild on average, but the occasional cold snap is what sizes the equipment: at a 14°F design temperature South Fulton 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 Hartsfield-Jackson Atlanta In, the closest NOAA station, 8.1 miles out.
The yearly running costs in South Fulton
A 2000-square-foot house here would pull roughly 1,743 heating kilowatt-hours annually on top of cooling, totalling about $556 a year on electricity. South Fulton's gas rate of $20.42 per Mcf, applied to the 22 Mcf a year the furnace burns, puts the current furnace-and-AC running cost near $896 a year, against 14.90¢ per kWh for electricity. Buying outright rather than at replacement time stretches payback to longer than the 15-year equipment life. Over 15 years, compared with a like-for-like replacement, the heat pump leaves you $408 behind.
How sensitive South Fulton's result is to prices
Gas would only overtake the heat pump in South Fulton if electricity rose past 62.8¢/kWh from 14.90¢, or gas fell under $4.85 per Mcf from $20.42. A useful quote test for South Fulton: the heat pump is worth it within a decade if it costs less than $3,390 more than replacing the furnace and AC, and within 7 years if the gap is under $2,373.
Electric resistance heat in South Fulton, compared
Gas isn't universal in South Fulton, many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and South Fulton's answer improves. Switching saves about $684 a year here, a heat pump moving heat rather than generating it needs far less electricity than resistance coils, so the extra $10,000 spent up front comes back in about 14.6 years.
South Fulton against the rest of the country
Ranked against the other 3206 cities covered, South Fulton comes in at 2381 for heating severity, 1 would be the coldest place in the dataset, and 287 by population, where 1 is largest. That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
Next step if you live in South Fulton
South Fulton, Georgia is home to about 112,003 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 South Fulton, nothing is lost by holding off until the current equipment genuinely fails.
Line up a few local HVAC quotes before you decide.
Where South Fulton's figure comes from
Every constant behind this page, the 3.04 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. South Fulton's 14°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.