Heat Pump Payback in Marietta, GA
Marietta, GA: the heat pump payback math
In Marietta, the extra upfront cost technically comes back, just not before the equipment wears out. $5,500 is what Marietta would pay extra to go electric rather than replace the furnace and AC with the same again. Marietta's residents would see roughly $341 a year back in running costs, putting the payback around 16.1 years. Marietta's own numbers say this pencils out only in theory, not in practice.
Compare against another city
Landed on Marietta by mistake, or want to compare it against somewhere else? Search the other 3206 cities below.
The climate behind Marietta's payback figure
Marietta has a mild winter by US standards, 2337 heating degree days a year against a 65°F base, and summers are hot enough that cooling matters as much as heating, at 2091 cooling degree days. 12.7°F is the figure equipment gets sized against here, the 99th-percentile cold snap, not an average day, with a low of 11.3°F in the 2024 station record. Worked through the model, that's a seasonal COP of 3 on the cold-climate unit fit for this climate. The average winter here is gentle, but sizing follows the cold snaps, and 12.7°F is below the 25°F point where a standard unit leans on resistance backup, so a cold-climate unit is what gets priced for Marietta. These numbers come from Dobbins Air Reserve Base Airp, the closest NOAA station, 2.9 miles out.
The yearly running costs in Marietta
A 2000-square-foot house here would pull roughly 1,973 heating kilowatt-hours annually on top of cooling, totalling about $560 a year on electricity. That compares with roughly 24 Mcf a year of gas at Marietta's $20.42 per-Mcf rate, about $901 a year with the old AC included, against a local electricity rate of 14.90¢/kWh. Priced as a standalone purchase, with a working furnace ripped out early, payback would take longer than the 15-year equipment life. Measured against the like-for-like replacement instead, a household here ends 15 years $382 behind.
The break-even point in Marietta
This result holds unless electricity climbs above 47.5¢/kWh (it is 14.90¢ now) or gas drops below $6.40 per Mcf (now $20.42); past either point, gas becomes the cheaper fuel in Marietta. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $341 a year saved, a difference under $2,387 pays back within 7 years here, and under $3,410 within 10.
If your home heats with electric baseboard instead of gas
Gas isn't universal in Marietta, many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Marietta's answer improves. The saving here runs about $726 a year, which recovers the extra $10,000 spent going electric in roughly 13.8 years.
Where Marietta ranks in this dataset
Among 3206 cities, Marietta's winter puts it at rank 2262 for severity, while its size puts it at rank 625 for population, 1 in both cases being the extreme. That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
Deciding what's next in Marietta, GA
About 63,122 people live in Marietta, Georgia, 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.
Reading further on this page's numbers
The methodology guide walks through exactly how Marietta's 3 seasonal COP and the rest of this page's numbers get built. Marietta's 12.7°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.