Coral Gables, FL: the heat pump payback math
In Coral Gables, 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. The window here is reasonable, and it's specific to what Coral Gables actually pays for power and gas.
How cold Coral Gables actually gets
Degree days tell the story here: Coral Gables racks up 19 heating degree days each year (base 65°F), and summers are severe enough that cooling can dominate the annual bill, with 4767 cooling degree days on the cooling side. 56.7°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 54.9°F on file. Worked through the model, that's a seasonal COP of 3.89 on the standard unit fit for this climate. Coral Gables's winters don't get cold enough to need the cold-climate premium — a standard unit holds up fine. Source: NOAA station VIRGINIA KEY, 7.7 miles from Coral Gables — the closest one on record.
Coral Gables's running-cost comparison, in dollars
Modelled on a typical 2000-square-foot house, the heat pump draws about 12 kWh a year to keep it warm, plus cooling, for a combined electric bill near $629 a year. Coral Gables'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. Buy it outright, not incrementally, and payback stretches to 33.4 years; over 15 years the net position sits $3,939 ahead.
The other scenario: no gas furnace to begin with
Not every home in Coral Gables has gas service. Swap the comparison to resistance heat instead of gas, and Coral Gables's answer improves. The saving here runs about $332 a year, which recovers the extra $5,500 spent going electric in roughly 16.6 years.
How Coral Gables compares nationally
Coral Gables lands at position 3202 out of 3206 cities on heating severity (coldest is 1), and 811 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.
Next step for 50,379 people in Coral Gables
Coral Gables, Florida is home to about 50,379 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, Coral Gables is a place worth lining up quotes ahead of a breakdown, not waiting for one.
Line up a few local HVAC quotes before you decide.
Reading further on this page's numbers
The methodology guide walks through exactly how Coral Gables's 3.89 seasonal COP and the rest of this page's numbers get built. The $2,000 federal credit baked into Coral Gables's number is explained, with the before-and-after math, in the tax credit guide.