Jeff Davis County, TX Insulation Payback
Jeff Davis County attic insulation, by the numbers
Jeff Davis County sits in IECC climate zone 3 (Hot-Dry) — intense summer heat with low humidity, where attic radiant heat gain is the main driver. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-49. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-49 runs an estimated $2,820, and saves about $972 a year in heating and cooling — a payback around 2.9 years. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $814 a year on the heating side, $158 on cooling. By estimated insulation savings, Jeff Davis County lands in the 14th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Jeff Davis County comes in 536th by savings. Texas averages $1,035/year across the counties tracked here; Jeff Davis County comes in 6% lower.
Jeff Davis County's actual weather, not a national average
NOAA's MT LOCKE, TX US station, 11.4 miles from Jeff Davis County, supplies the 3,068 HDD and 989 CDD this estimate runs on. That combined heating-and-cooling load ranks Jeff Davis County 3073rd nationally by total degree days — the 3th percentile. One local detail the R-value alone won't tell you: Jeff Davis County sits in moisture regime B (dry), which can affect the vapor-barrier choice.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $131/year saved — roughly 12.4 years to break even. Call this borderline rather than a clear win.
Getting it done in Jeff Davis County
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $2,820 figure above as a planning number for Jeff Davis County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Jeff Davis 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.