Granbury, TX: the heat pump payback math
In Granbury, the math is close enough that it comes down to how long you plan to stay. $3,500 is what Granbury would pay extra to go electric rather than replace the furnace and AC with the same again, once the $2,000 federal credit is applied. Lower bills claw that back: about $317 saved annually, for a payback of roughly 11 years. It's a genuine toss-up here — Granbury's numbers don't point clearly either way.
Granbury's weather, in the numbers that matter
Degree days tell the story here: Granbury racks up 1866 heating degree days each year (base 65°F), and summers are severe enough that cooling can dominate the annual bill, with 2667 cooling degree days on the cooling side. 14°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 9.9°F on file. Worked through the model, that's a seasonal COP of 3.04 on the cold-climate unit fit for this climate. Granbury needs the cold-climate class of unit: past a 25°F design temperature a standard heat pump falls back on resistance backup often enough to eat the savings. Source: NOAA station CLARK FIELD MUNI AIRPORT, 27.9 miles from Granbury — the closest one on record.
Granbury's running-cost comparison, in dollars
A 2000-square-foot house here would pull roughly 1,554 heating kilowatt-hours annually on top of cooling, totalling about $618 a year on electricity. That compares with roughly 19 Mcf a year of gas at Granbury's 19.42 per-Mcf rate — about $936 a year — against a local electricity rate of 16.15¢/kWh. Buy it outright, not incrementally, and payback stretches to 42.5 years; over 15 years the net position sits $1,260 ahead.
Electric resistance heat in Granbury, compared
Gas isn't universal in Granbury — many houses run on electric heat already. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. The saving here runs about $703 a year, which recovers the extra $8,000 spent going electric in roughly 11.4 years.
Granbury against the rest of the country
Among 3206 cities, Granbury's winter puts it at rank 2498 for severity, while its size puts it at rank 2662 for population — 1 in both cases being the extreme. That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
Deciding what's next in Granbury, TX
Granbury, Texas is home to about 12,934 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 Granbury, nothing is lost by holding off until the current equipment genuinely fails.
Get quotes from local HVAC contractors before deciding.
Where Granbury's figure comes from
Nothing above is a black box: the methodology guide shows the full arithmetic behind Granbury's 3.04 seasonal COP and payback figure. Granbury's 14°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.