Doraville, GA: the heat pump payback math
In Doraville, the math is close enough that it comes down to how long you plan to stay. $3,500 is what Doraville would pay extra to go electric rather than replace the furnace and AC with the same again, once the $2,000 federal credit is applied. That premium is recovered through $344 of lower running costs every year, landing the payback clock at roughly 10.2 years. It's a genuine toss-up here — Doraville's numbers don't point clearly either way.
Doraville's weather, in the numbers that matter
Degree days tell the story here: Doraville racks up 2569 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 1846 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: 12°F here (record low 10.9°F), which works out to a seasonal COP of 2.99 for the cold-climate class of unit this climate calls for. Doraville 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 DEKALB-PEACHTREE AIRPORT, the closest NOAA station, 2.9 miles out.
The month-to-month numbers for Doraville
A 2000-square-foot house here would pull roughly 2,176 heating kilowatt-hours annually on top of cooling, totalling about $559 a year on electricity. Doraville's gas rate of 20.42 per Mcf, applied to the 27 Mcf a year the furnace burns, puts its running cost near $903 a year, against 14.90¢ per kWh for electricity. Looked at as a full purchase rather than an incremental one, payback here is roughly 39.2 years, leaving the 15-year total $1,662 ahead.
If your home heats with electric baseboard instead of gas
Plenty of homes in Doraville 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. Switching saves about $767 a year here — a heat pump moving heat rather than generating it needs far less electricity than resistance coils — so the extra $8,000 spent up front comes back in about 10.4 years.
Doraville against the rest of the country
Doraville lands at position 2116 out of 3206 cities on heating severity (coldest is 1), and 2741 out of 3206 by population size (biggest is 1). That's the middle third for winter severity among the cities covered here.
Next step for 12,436 people in Doraville
Doraville, Georgia is home to about 12,436 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 Doraville, nothing is lost by holding off until the current equipment genuinely fails.
Line up a few local HVAC quotes before you decide.
Where Doraville's figure comes from
Every constant behind this page — the 2.99 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. Doraville's 12°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.