Jasper County, TX Insulation Payback
Jasper County, TX: what topping up your attic actually costs
DOE classifies Jasper County as climate zone 2, hot-humid — long, muggy summers and mild winters, where cooling dominates the energy 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 $892 a year — payback in roughly 3.2 years. The math clears comfortably within a normal ownership horizon.
The breakdown behind the number
The estimated savings split roughly $508/year heating, $384/year cooling. Out of every 100 US counties tracked here, Jasper County's savings potential beats roughly 9 of them. Within zone 2 specifically, it ranks 51st of 233 counties by estimated savings. Texas averages $1,035/year across the counties tracked here; Jasper County comes in 14% lower.
The climate data behind this
The heating and cooling degree days behind this estimate — 1,916 HDD and 2,410 CDD (base 65°F, 1991-2020 normals) — come from TOWN BLUFF DAM, TX US, the nearest NOAA station with published normals, 9.9 miles from Jasper County's center. That combined heating-and-cooling load ranks Jasper County 2941st nationally by total degree days — the 7th percentile. Jasper County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
If the attic isn't bare
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $120/year saved — roughly 13.5 years to break even. This one is a genuine toss-up, not a clear yes.
Next steps for a Jasper County attic
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 Jasper County's estimated $892/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.