Sutton County, TX Insulation Payback
Sutton County, TX: what topping up your attic actually costs
Sutton County, Texas is zone 3 under DOE's climate map (Hot-Dry), which means intense summer heat with low humidity, where attic radiant heat gain is the main driver. An uninsulated attic there should be built 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 $1,010 a year in heating and cooling — a payback around 2.8 years.
That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $600/year heating, $409/year cooling. Out of every 100 US counties tracked here, Sutton County's savings potential beats roughly 17 of them. Within zone 3 specifically, it ranks 450th of 690 counties by estimated savings. Texas averages $1,035/year across the counties tracked here; Sutton County comes in 2% lower.
Where these numbers come from
NOAA's Sonora, TX US station, 9.2 miles from Sutton County, supplies the 2,263 HDD and 2,567 CDD this estimate runs on. By total degree days, Sutton County sits at the 20th percentile nationally. Sutton County falls in DOE's moisture regime B (dry), a detail that affects vapor-barrier recommendations more than the R-value target itself.
Already have some insulation?
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 $136/year saved (~11.9-year payback). This one is a genuine toss-up, not a clear yes.
Next steps for a Sutton County attic
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first, so treat the $2,820 figure above as a planning number for Sutton County, not a bid. Worth getting quotes from at least two local contractors before committing - most 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.