Clay County, TX Insulation Payback
Clay County, TX: what topping up your attic actually costs
DOE classifies Clay County as climate zone 3, mixed-humid — a genuine mix of cold winters and humid summers, with neither one dominating the bill. Its recommended attic R-value for bare joists is 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 $1,160 a year — payback in roughly 2.4 years. That's about as fast as attic paybacks get.
Heating vs. cooling in Clay County
The estimated savings split roughly $795/year heating, $365/year cooling. Out of every 100 US counties tracked here, Clay County's savings potential beats roughly 28 of them. Within zone 3 specifically, it ranks 149th of 690 counties by estimated savings. Texas averages $1,035/year across the counties tracked here; Clay County comes in 12% higher.
Where these numbers come from
NOAA's HENRIETTA, TX US station, 2 miles from Clay County, supplies the 2,998 HDD and 2,290 CDD this estimate runs on. By total degree days, Clay County sits at the 34th percentile nationally. Clay County falls in DOE's moisture regime A (humid), 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 $156/year saved (~10.4-year payback). This one is a genuine toss-up, not a clear yes.
Getting it done in Clay 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 Clay County's estimated $1,160/year on the line.
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.