Heat Pump Payback in Hattiesburg, MS
Heat pump vs. gas furnace in Hattiesburg, MS
The payback math works in Hattiesburg on paper, past the equipment's own working life. Against a like-for-like gas furnace and AC swap, going electric costs $5,500 more up front here. Hattiesburg's residents would see roughly $279 a year back in running costs, putting the payback around 19.7 years. That's a technicality, not a recommendation, for anyone actually living in Hattiesburg.
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Hattiesburg is one of 3206 cities covered here, each run through the same model. Search another below.
Hattiesburg's weather, in the numbers that matter
Hattiesburg has a mild winter by US standards, 1503 heating degree days a year against a 65°F base, and summers are severe enough that cooling can dominate the annual bill, at 2911 cooling degree days. Sizing runs off the design temperature, not the average day: 23°F here (coldest 2024 reading 15.1°F), which works out to a seasonal COP of 3.25 for the cold-climate class of unit this climate calls for. Mild on average, but the occasional cold snap is what sizes the equipment: at a 23°F design temperature Hattiesburg falls just under the 25°F line where a standard heat pump starts leaning on resistance backup, so the model prices a cold-climate unit to be safe. These numbers come from Bobby L Chain Municipal Airport, the closest NOAA station, 4.2 miles out.
What it actually costs to run, year to year
A 2000-square-foot house here would pull roughly 1,171 heating kilowatt-hours annually on top of cooling, totalling about $565 a year on electricity. That compares with roughly 16 Mcf a year of gas at Hattiesburg's $16.64 per-Mcf rate, about $844 a year with the old AC included, against a local electricity rate of 15.47¢/kWh. If the current system still worked and you replaced it anyway, the full cost would take longer than the 15-year equipment life to earn back; against buying a new furnace and AC regardless, the 15-year total lands $1,315 behind.
What would change Hattiesburg's answer
In Hattiesburg the cooling savings outweigh the extra electricity for heating, so no plausible change in the electricity rate would make the old furnace and AC cheaper to run. A useful quote test for Hattiesburg: the heat pump is worth it within a decade if it costs less than $2,790 more than replacing the furnace and AC, and within 7 years if the gap is under $1,953.
Electric resistance heat in Hattiesburg, compared
Gas isn't universal in Hattiesburg, many houses run on electric heat already. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. The gap still doesn't close: the $10,000 incremental cost outlasts the 15-year equipment life here even against resistance heat.
Where Hattiesburg ranks in this dataset
Among 3206 cities, Hattiesburg's winter puts it at rank 2690 for severity, while its size puts it at rank 849 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 Hattiesburg
Hattiesburg, Mississippi is home to about 48,522 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 Hattiesburg, nothing is lost by holding off until the current equipment genuinely fails.
Ask a local HVAC contractor for a quote before committing either way.
Where Hattiesburg's figure comes from
Every constant behind this page, the 3.25 seasonal COP, the degree-day corrections, the equipment costs, is documented in the methodology guide. Hattiesburg's 23°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.