Heat Pump Payback in Byram, MS
Byram, MS: the heat pump payback math
Byram technically pencils out, but only past the point the equipment would need replacing anyway. $5,500 is what Byram would pay extra to go electric rather than replace the furnace and AC with the same again. Byram's residents would see roughly $219 a year back in running costs, putting the payback around 25.1 years. Byram's own numbers say this pencils out only in theory, not in practice.
Compare against another city
Byram is one of 3206 cities covered here, each run through the same model. Search another below.
The climate behind Byram's payback figure
1947 heating degree days pile up here every year, so Byram has a mild winter by US standards; the cooling side runs to 1781 cooling degree days, where summers are hot enough that cooling matters as much as heating. 19.4°F is the figure equipment gets sized against here, the 99th-percentile cold snap, not an average day, with a low of 8.6°F in the 2024 station record. Worked through the model, that's a seasonal COP of 3.17 on the cold-climate unit fit for this climate. The average winter here is gentle, but sizing follows the cold snaps, and 19.4°F is below the 25°F point where a standard unit leans on resistance backup, so a cold-climate unit is what gets priced for Byram. These numbers come from John Bell Williams Airport, the closest NOAA station, 10.6 miles out.
The yearly running costs in Byram
Electricity use for heating alone comes out to about 1,555 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $476 a year. The gas furnace it replaces burns roughly 20 Mcf a year at $16.64 per Mcf here, for a running cost near $694 a year including the old AC (electricity here runs 15.47¢/kWh). Buying outright rather than at replacement time stretches payback to longer than the 15-year equipment life. Over 15 years, compared with a like-for-like replacement, the heat pump leaves you $2,215 behind.
What would change Byram's answer
This result holds unless electricity climbs above 44.1¢/kWh (it is 15.47¢ now) or gas drops below $5.84 per Mcf (now $16.64); past either point, gas becomes the cheaper fuel in Byram. When quotes arrive, compare the heat pump price with a like-for-like furnace and AC replacement: at $219 a year saved, a difference under $1,533 pays back within 7 years here, and under $2,190 within 10.
If your home heats with electric baseboard instead of gas
Not every home in Byram 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. Even against resistance heat, the running-cost gap here isn't enough to clear the $10,000 incremental cost within the equipment's 15-year life.
Where Byram ranks in this dataset
Ranked against the other 3206 cities covered, Byram comes in at 2451 for heating severity, 1 would be the coldest place in the dataset, and 2705 by population, where 1 is largest. 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 Byram
About 12,656 people live in Byram, Mississippi, 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 3.17 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. At a 19.4°F design temperature, Byram sits in cold-climate territory; the guide to that class of unit explains why.