Alabaster, AL: the heat pump payback math
This one's marginal in Alabaster: it only clears if you stay long enough. 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). Alabaster's residents would see roughly $269 a year back in running costs, putting the payback around 13 years. It's a genuine toss-up here — Alabaster's numbers don't point clearly either way.
How cold Alabaster actually gets
Alabaster has a mild winter by US standards — 2103 heating degree days a year against a 65°F base — and summers are hot enough that cooling matters as much as heating, at 2273 cooling degree days. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 18°F, against a record low of 10.9°F. That puts the seasonal coefficient of performance at 3.13 for the recommended cold-climate unit. Below the 25°F line where a standard machine starts leaning on resistance backup, Alabaster sits firmly in cold-climate territory, so that's the class of unit priced here. These numbers come from SHELBY COUNTY AIRPORT, the closest NOAA station, 3.5 miles out.
The month-to-month numbers for Alabaster
A 2000-square-foot house here would pull roughly 1,701 heating kilowatt-hours annually on top of cooling, totalling about $605 a year on electricity. That compares with roughly 22 Mcf a year of gas at Alabaster's 17.56 per-Mcf rate — about $874 a year — against a local electricity rate of 16.62¢/kWh. Buy it outright, not incrementally, and payback stretches to 50.1 years; over 15 years the net position sits $540 ahead.
The other scenario: no gas furnace to begin with
Not every home in Alabaster has gas service. Against electric-resistance heat — baseboard or an electric furnace, both 100% efficient but still just resistance — the case for switching gets stronger here. The saving here runs about $770 a year, which recovers the extra $8,000 spent going electric in roughly 10.4 years.
How Alabaster compares nationally
Alabaster lands at position 2375 out of 3206 cities on heating severity (coldest is 1), and 1192 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 for 34,460 people in Alabaster
Alabaster, Alabama is home to about 34,460 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 Alabaster, nothing is lost by holding off until the current equipment genuinely fails.
Ask a local HVAC contractor for a quote before committing either way.
More on how this number was built
The methodology guide walks through exactly how Alabaster's 3.13 seasonal COP and the rest of this page's numbers get built. Alabaster's 18°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.