Heat Pump Payback in Grenada, MS
Should Grenada switch to a heat pump?
The payback math works in Grenada 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. Grenada's residents would see roughly $280 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 Grenada.
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How cold Grenada actually gets
Degree days tell the story here: Grenada racks up 1903 heating degree days each year (base 65°F), and summers are severe enough that cooling can dominate the annual bill, with 2708 cooling degree days on the cooling side. 19°F is the figure equipment gets sized against here, the 99th-percentile cold snap, not an average day, with a low of 9°F in the 2024 station record. Worked through the model, that's a seasonal COP of 3.16 on the cold-climate unit fit for this climate. Mild on average, but the occasional cold snap is what sizes the equipment: at a 19°F design temperature Grenada 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. Climate figures trace to the nearest NOAA station, Greenwood-Leflore Airport, 25.3 miles from Grenada.
What it actually costs to run, year to year
Modelled on a typical 2000-square-foot house, the heat pump draws about 1,525 kWh a year to keep it warm, plus cooling, for a combined electric bill near $593 a year. The gas furnace it replaces burns roughly 20 Mcf a year at $16.64 per Mcf here, for a running cost near $873 a year including the old AC (electricity here runs 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 $1,306 behind.
How sensitive Grenada's result is to prices
Gas would only overtake the heat pump in Grenada if electricity rose past 101.7¢/kWh from 15.47¢, or gas fell under $2.53 per Mcf from $16.64. A useful quote test for Grenada: the heat pump is worth it within a decade if it costs less than $2,800 more than replacing the furnace and AC, and within 7 years if the gap is under $1,960.
Electric resistance heat in Grenada, compared
Plenty of homes in Grenada heat with electricity alone, no gas line involved. Against electric-resistance heat, baseboard or an electric furnace, both 100% efficient but still just resistance, the case for switching gets stronger here. Switching saves about $695 a year here, a heat pump moving heat rather than generating it needs far less electricity than resistance coils, so the extra $10,000 spent up front comes back in about 14.4 years.
How Grenada compares nationally
Ranked against the other 3206 cities covered, Grenada comes in at 2483 for heating severity, 1 would be the coldest place in the dataset, and 2792 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 Grenada
Grenada, Mississippi is home to about 12,138 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 Grenada, nothing is lost by holding off until the current equipment genuinely fails.
Line up a few local HVAC quotes before you decide.
Reading further on this page's numbers
Nothing above is a black box: the methodology guide shows the full arithmetic behind Grenada's 3.16 seasonal COP and payback figure. Grenada's 19°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.