Culberson County, TX Insulation Payback
Culberson County, TX: what topping up your attic actually costs
Culberson County, Texas is zone 3 under DOE's climate map (Hot-Dry), which means desert-dry heat for much of the year, with the attic taking the brunt of it. An uninsulated attic there should be built up to R-49. Going from R-2 to the recommended R-49 costs roughly $2,820 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2.7 years at an estimated $1,064/year saved. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $799/year heating, $266/year cooling. Out of every 100 US counties tracked here, Culberson County's savings potential beats roughly 22 of them. Within zone 3 specifically, it ranks 326th of 690 counties by estimated savings. Texas averages $1,035/year across the counties tracked here; Culberson County comes in 3% higher.
The climate data behind this
NOAA's PINE SPRINGS NP, TX US station, 31.4 miles from Culberson County, supplies the 3,010 HDD and 1,666 CDD this estimate runs on. That combined heating-and-cooling load ranks Culberson County 2659th nationally by total degree days — the 16th percentile. Culberson County falls in DOE's moisture regime B (dry), a detail that affects vapor-barrier recommendations more than the R-value target itself.
If the attic isn't bare
A shallower starting point changes the math: with R-11 already down, only the gap to R-38 needs filling, at roughly $1,620 for an estimated $143/year saved (~11.3-year payback). This one is a genuine toss-up, not a clear yes.
Getting it done in Culberson 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 Culberson County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-49 is the target here specifically.