Vicksburg, MS: the heat pump payback math
This one's marginal in Vicksburg: it only clears if you stay long enough. $3,500 is what Vicksburg 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. Lower bills claw that back: about $259 saved annually, for a payback of roughly 13.5 years. It's a genuine toss-up here — Vicksburg's numbers don't point clearly either way.
How cold Vicksburg actually gets
1785 heating degree days pile up here every year, so Vicksburg has a mild winter by US standards; the cooling side runs to 2487 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 19.4°F, against a record low of 8.6°F. That puts the seasonal coefficient of performance at 3.17 for the recommended cold-climate unit. Below the 25°F line where a standard machine starts leaning on resistance backup, Vicksburg sits firmly in cold-climate territory, so that's the class of unit priced here. Source: NOAA station VICKSBURG MUNICIPAL AIRPORT, 6.8 miles from Vicksburg — the closest one on record.
Vicksburg's running-cost comparison, in dollars
Electricity use for heating alone comes out to about 1,426 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $549 a year. That compares with roughly 19 Mcf a year of gas at Vicksburg's 16.64 per-Mcf rate — about $808 a year — against a local electricity rate of 15.47¢/kWh. Buy it outright, not incrementally, and payback stretches to 52.1 years; over 15 years the net position sits $390 ahead.
The other scenario: no gas furnace to begin with
Plenty of homes in Vicksburg heat with electricity alone, no gas line involved. Swap the comparison to resistance heat instead of gas, and Vicksburg's answer improves. About $649 a year comes back this way, enough that the 12.3-year payback clears the $8,000 premium comfortably within the equipment's life.
Vicksburg against the rest of the country
Among 3206 cities, Vicksburg's winter puts it at rank 2547 for severity, while its size puts it at rank 1921 for population — 1 in both cases being the extreme. That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
What to do with this number in Vicksburg
Vicksburg, Mississippi is home to about 20,032 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 Vicksburg, nothing is lost by holding off until the current equipment genuinely fails.
Line up a few local HVAC quotes before you decide.
More on how this number was built
The methodology guide walks through exactly how Vicksburg's 3.17 seasonal COP and the rest of this page's numbers get built. At a 19.4°F design temperature, Vicksburg sits in cold-climate territory; the guide to that class of unit explains why.