Heat pump vs. gas furnace in Chamblee, GA
In Chamblee, the math is close enough that it comes down to how long you plan to stay. Against a like-for-like gas furnace and AC swap, going electric costs $3,500 more up front here (already netting out a $2,000 tax credit). That premium is recovered through $344 of lower running costs every year, landing the payback clock at roughly 10.2 years. Whether that's worth it in Chamblee depends on how many years you expect to own the place.
The climate behind Chamblee's payback figure
Degree days tell the story here: Chamblee 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. A cold-climate unit is the right call in Chamblee — below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. Source: NOAA station DEKALB-PEACHTREE AIRPORT, 0.4 miles from Chamblee — the closest one on record.
What it actually costs to run, year to year
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 (electricity here runs 14.90¢/kWh). 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.
The other scenario: no gas furnace to begin with
Gas isn't universal in Chamblee — many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Chamblee's answer improves. About $767 a year comes back this way, enough that the 10.4-year payback clears the $8,000 premium comfortably within the equipment's life.
Chamblee against the rest of the country
Ranked against the other 3206 cities covered, Chamblee comes in at 2111 for heating severity — 1 would be the coldest place in the dataset — and 1267 by population, where 1 is largest. That's the middle third for winter severity among the cities covered here.
What to do with this number in Chamblee
About 32,321 people live in Chamblee, 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.
Line up a few local HVAC quotes before you decide.
More on how this number was built
Every constant behind this page — the 2.99 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. Chamblee's 12°F design temperature falls on the cold side of the 25°F cutoff the cold-climate unit guide walks through.