Heat Pump Payback in Smyrna, GA
Should Smyrna switch to a heat pump?
Smyrna technically pencils out, but only past the point the equipment would need replacing anyway. Against a like-for-like gas furnace and AC swap, going electric costs $5,500 more up front here. Smyrna's residents would see roughly $341 a year back in running costs, putting the payback around 16.1 years. That's a technicality, not a recommendation, for anyone actually living in Smyrna.
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Smyrna's weather, in the numbers that matter
Degree days tell the story here: Smyrna racks up 2337 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 2091 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: 12.7°F here (coldest 2024 reading 11.3°F), which works out to a seasonal COP of 3 for the cold-climate class of unit this climate calls for. Mild on average, but the occasional cold snap is what sizes the equipment: at a 12.7°F design temperature Smyrna 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 Dobbins Air Reserve Base Airp, the closest NOAA station, 3.8 miles out.
Smyrna's running-cost comparison, in dollars
Modelled on a typical 2000-square-foot house, the heat pump draws about 1,973 kWh a year to keep it warm, plus cooling, for a combined electric bill near $560 a year. Smyrna's gas rate of $20.42 per Mcf, applied to the 24 Mcf a year the furnace burns, puts the current furnace-and-AC running cost near $901 a year, against 14.90¢ per kWh for electricity. 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.
What would change Smyrna's answer
Gas would only overtake the heat pump in Smyrna if electricity rose past 47.5¢/kWh from 14.90¢, or gas fell under $6.40 per Mcf from $20.42. A useful quote test for Smyrna: the heat pump is worth it within a decade if it costs less than $3,410 more than replacing the furnace and AC, and within 7 years if the gap is under $2,387.
Electric resistance heat in Smyrna, compared
Plenty of homes in Smyrna heat with electricity alone, no gas line involved. Swap the comparison to resistance heat instead of gas, and Smyrna's answer improves. About $726 a year comes back this way, enough that the 13.8-year payback clears the $10,000 premium comfortably within the equipment's life.
Smyrna against the rest of the country
Smyrna lands at position 2263 out of 3206 cities on heating severity (coldest is 1), and 717 out of 3206 by population size (biggest is 1). 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 Smyrna
Smyrna, Georgia is home to about 57,177 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 Smyrna, nothing is lost by holding off until the current equipment genuinely fails.
Ask a local HVAC contractor for a quote before committing either way.
Reading further on this page's numbers
Nothing above is a black box: the methodology guide shows the full arithmetic behind Smyrna's 3 seasonal COP and payback figure. Smyrna's 12.7°F design temperature is below the 25°F line, which is why a cold-climate unit is the right call here, see what that changes in the cold-climate unit guide.