Is a heat pump worth it in Miami?
In Miami, a heat pump pays for itself within a reasonable window. 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). Lower bills claw that back: about $329 saved annually, for a payback of roughly 3 years. That's a real payback, built from Miami's own climate and utility rates, not a national guess.
Why Miami's climate drives this number
19 heating degree days pile up here every year, so Miami barely has a winter to speak of; the cooling side runs to 4767 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 56.7°F, against a record low of 54.9°F. That puts the seasonal coefficient of performance at 3.89 for the recommended standard unit. A standard ducted system is enough here; Miami's design temperature doesn't justify the cold-climate premium. These numbers come from VIRGINIA KEY, the closest NOAA station, 4.8 miles out.
What it actually costs to run, year to year
A 2000-square-foot house here would pull roughly 12 heating kilowatt-hours annually on top of cooling, totalling about $629 a year on electricity. Miami's gas rate of 25.48 per Mcf, applied to the 0 Mcf a year the furnace burns, puts its running cost near $958 a year, against 15.43¢ per kWh for electricity. Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs about 33.4 years, for a 15-year net position $3,939 ahead.
The other scenario: no gas furnace to begin with
Not every home in Miami 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. The saving here runs about $332 a year, which recovers the extra $5,500 spent going electric in roughly 16.6 years.
Where Miami ranks in this dataset
Miami lands at position 3200 out of 3206 cities on heating severity (coldest is 1), and 42 out of 3206 by population size (biggest is 1). That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
Deciding what's next in Miami, FL
About 487,014 people live in Miami, 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.
Get quotes from local HVAC contractors before deciding.
Where Miami's figure comes from
The methodology guide walks through exactly how Miami's 3.89 seasonal COP and the rest of this page's numbers get built. See what Miami's figure looks like without the $2,000 federal credit in the guide to how that credit moves the payback window.