Will a heat pump pay off in Lewisville, TX?
In Lewisville, the math is close enough that it comes down to how long you plan to stay. $3,500 is what Lewisville 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 $361 saved annually, for a payback of roughly 9.7 years. It's a genuine toss-up here — Lewisville's numbers don't point clearly either way.
How cold Lewisville actually gets
Degree days tell the story here: Lewisville racks up 1620 heating degree days each year (base 65°F), and summers are severe enough that cooling can dominate the annual bill, with 3408 cooling degree days on the cooling side. 18.9°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 9.5°F on file. Worked through the model, that's a seasonal COP of 3.15 on the cold-climate unit fit for this climate. Below the 25°F line where a standard machine starts leaning on resistance backup, Lewisville sits firmly in cold-climate territory, so that's the class of unit priced here. Source: NOAA station ADDISON AIRPORT, 9.8 miles from Lewisville — the closest one on record.
Lewisville's running-cost comparison, in dollars
Modelled on a typical 2000-square-foot house, the heat pump draws about 1,302 kWh a year to keep it warm, plus cooling, for a combined electric bill near $680 a year. That compares with roughly 17 Mcf a year of gas at Lewisville's 19.42 per-Mcf rate — about $1,041 a year — against a local electricity rate of 16.15¢/kWh. Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs about 37.4 years, for a 15-year net position $1,920 ahead.
If your home heats with electric baseboard instead of gas
Plenty of homes in Lewisville heat with electricity alone, no gas line involved. Swap the comparison to resistance heat instead of gas, and Lewisville's answer improves. The saving here runs about $696 a year, which recovers the extra $8,000 spent going electric in roughly 11.5 years.
How Lewisville compares nationally
Among 3206 cities, Lewisville's winter puts it at rank 2643 for severity, while its size puts it at rank 216 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 Lewisville, TX
Lewisville, Texas is home to about 135,983 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 Lewisville, nothing is lost by holding off until the current equipment genuinely fails.
Ask a local HVAC contractor for a quote before committing either way.
More on how this number was built
Every constant behind this page — the 3.15 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. Lewisville's 18.9°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.