Should Seminole switch to a heat pump?

A heat pump earns back its extra cost in Seminole within a sensible timeframe. 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). Seminole's residents would see roughly $326 a year back in running costs, putting the payback around 3.1 years. The window here is reasonable, and it's specific to what Seminole actually pays for power and gas.

How cold Seminole actually gets

Seminole barely has a winter to speak of — 364 heating degree days a year against a 65°F base — and summers are severe enough that cooling can dominate the annual bill, at 3958 cooling degree days. The 99% winter design temperature here — the cold snap equipment must be sized for, not the seasonal average — is 43°F, against a record low of 37.9°F. That puts the seasonal coefficient of performance at 3.48 for the recommended standard unit. Seminole's winters don't get cold enough to need the cold-climate premium — a standard unit holds up fine. These numbers come from ST PETE-CLWTR INTL AIRPORT, the closest NOAA station, 7.6 miles out.

The month-to-month numbers for Seminole

Modelled on a typical 2000-square-foot house, the heat pump draws about 265 kWh a year to keep it warm, plus cooling, for a combined electric bill near $562 a year. That compares with roughly 4 Mcf a year of gas at Seminole's 25.48 per-Mcf rate — about $888 a year — against a local electricity rate of 15.43¢/kWh. Buy it outright, not incrementally, and payback stretches to 33.7 years; over 15 years the net position sits $3,897 ahead.

The other scenario: no gas furnace to begin with

Not every home in Seminole 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. Switching saves about $372 a year here — a heat pump moving heat rather than generating it needs far less electricity than resistance coils — so the extra $5,500 spent up front comes back in about 14.8 years.

Seminole against the rest of the country

Ranked against the other 3206 cities covered, Seminole comes in at 3101 for heating severity — 1 would be the coldest place in the dataset — and 1980 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.

Next step for 19,395 people in Seminole

Seminole, Florida is home to about 19,395 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. Given the math above, Seminole is a place worth lining up quotes ahead of a breakdown, not waiting for one.

Ask a local HVAC contractor for a quote before committing either way.

Reading further on this page's numbers

Every constant behind this page — the 3.48 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. The $2,000 federal credit baked into Seminole's number is explained, with the before-and-after math, in the tax credit guide.