Gulfport, FL: the heat pump payback math
The math in Gulfport isn't close — a heat pump wins outright. Against a like-for-like gas furnace and AC swap, going electric costs $1,000 more up front here (already netting out a $2,000 tax credit). Gulfport's residents would see roughly $345 a year back in running costs, putting the payback around 2.9 years. Nothing about that conclusion is generic — it's built entirely from Gulfport's own numbers.
Why Gulfport's climate drives this number
348 heating degree days pile up here every year, so Gulfport barely has a winter to speak of; the cooling side runs to 4259 cooling degree days, where summers are severe enough that cooling can dominate the annual bill. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 45°F, against a record low of 41°F. That puts the seasonal coefficient of performance at 3.54 for the recommended standard unit. A standard ducted system is enough here; Gulfport's design temperature doesn't justify the cold-climate premium. Source: NOAA station ALBERT WHITTED AIRPORT, 5.2 miles from Gulfport — the closest one on record.
The month-to-month numbers for Gulfport
Electricity use for heating alone comes out to about 249 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $599 a year. That compares with roughly 4 Mcf a year of gas at Gulfport's 25.48 per-Mcf rate — about $944 a year — against a local electricity rate of 15.43¢/kWh. Buy it outright, not incrementally, and payback stretches to 31.9 years; over 15 years the net position sits $4,180 ahead.
If your home heats with electric baseboard instead of gas
Not every home in Gulfport has gas service. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. About $389 a year comes back this way, enough that the 14.1-year payback clears the $5,500 premium comfortably within the equipment's life.
Where Gulfport ranks in this dataset
Ranked against the other 3206 cities covered, Gulfport comes in at 3105 for heating severity — 1 would be the coldest place in the dataset — and 2871 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 Gulfport
About 11,645 people live in Gulfport, Florida, 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, it's worth getting quotes before your current system fails, not after.
Line up a few local HVAC quotes before you decide.
More on how this number was built
The methodology guide walks through exactly how Gulfport's 3.54 seasonal COP and the rest of this page's numbers get built. See what Gulfport's figure looks like without the $2,000 federal credit in the guide to how that credit moves the payback window.