Should Alexandria switch to a heat pump?
In Alexandria, 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). Alexandria's residents would see roughly $278 a year back in running costs, putting the payback around 12.6 years. It's a genuine toss-up here — Alexandria's numbers don't point clearly either way.
How cold Alexandria actually gets
3197 heating degree days pile up here every year, so Alexandria has a real but manageable winter; the cooling side runs to 1889 cooling degree days, where summers are hot enough that cooling matters as much as heating. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 21°F, against a record low of 16°F. That puts the seasonal coefficient of performance at 3.2 for the recommended cold-climate unit. Alexandria 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. Climate figures trace to the nearest NOAA station, RONALD REAGAN WASHINGTON NATL, 3.2 miles from Alexandria.
What it actually costs to run, year to year
Modelled on a typical 2000-square-foot house, the heat pump draws about 2,530 kWh a year to keep it warm, plus cooling, for a combined electric bill near $686 a year. That compares with roughly 33 Mcf a year of gas at Alexandria's 16.79 per-Mcf rate — about $965 a year — against a local electricity rate of 16.58¢/kWh. Looked at as a full purchase rather than an incremental one, payback here is roughly 48.5 years, leaving the 15-year total $677 ahead.
If your home heats with electric baseboard instead of gas
Gas isn't universal in Alexandria — many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Alexandria's answer improves. About $1,062 a year comes back this way, enough that the 7.5-year payback clears the $8,000 premium comfortably within the equipment's life.
How Alexandria compares nationally
Alexandria lands at position 1847 out of 3206 cities on heating severity (coldest is 1), and 168 out of 3206 by population size (biggest is 1). That's the middle third for winter severity among the cities covered here.
What to do with this number in Alexandria
Alexandria, Virginia is home to about 159,102 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 Alexandria, 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 Alexandria's 3.2 seasonal COP and the rest of this page's numbers get built. Alexandria's 21°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.