Dallas County, TX Insulation Payback
Dallas County attic insulation, by the numbers
Dallas County, Texas is zone 3 under DOE's climate map (Hot-Humid), which means humid heat for much of the year, with cooling running far more than heating ever does. An uninsulated attic there should be built up to R-49. For an attic around 1,000 square feet, closing the gap from R-2 to R-49 costs around $2,820 and saves an estimated $1,027 a year — payback in roughly 2.7 years. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $529 a year on the heating side, $498 on cooling. By estimated insulation savings, Dallas County lands in the 18th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Dallas County comes in 420th by savings. Texas averages $1,035/year across the counties tracked here; Dallas County comes in 1% lower.
Where these numbers come from
NOAA's DALLAS LOVE FLD, TX US station, 7.4 miles from Dallas County, supplies the 1,992 HDD and 3,125 CDD this estimate runs on. By total degree days, Dallas County sits at the 29th percentile nationally. One local detail the R-value alone won't tell you: Dallas County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
Already have some insulation?
If Dallas County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-38. That smaller top-up costs around $1,620 and saves an estimated $138/year — payback about 11.7 years. Call this borderline rather than a clear win.
Getting it done in Dallas County
Get more than one quote before committing. Attic access and any needed air sealing move the price around, and most contractors won't take a job below roughly $600 regardless of size - worth asking upfront given Dallas County's estimated $1,027/year on the line.
Where these figures come from
Dallas County's R-49 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-49 is the target here specifically.