Galveston County, TX Insulation Payback
Galveston County, TX: what topping up your attic actually costs
DOE classifies Galveston 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. 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 3.5 years at an estimated $805/year saved. The math clears comfortably within a normal ownership horizon.
The breakdown behind the number
The estimated savings split roughly $236/year heating, $569/year cooling. Out of every 100 US counties tracked here, Galveston County's savings potential beats roughly 4 of them. Within zone 2 specifically, it ranks 171st of 233 counties by estimated savings. Texas averages $1,035/year across the counties tracked here; Galveston County comes in 22% lower.
The climate data behind this
Galveston County's climate figures — 889 heating and 3,571 cooling degree days a year — are read from GALVESTON SCHOLES FLD, TX US, 3.2 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Galveston County 2841st nationally by total degree days — the 10th percentile. Galveston 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?
If Galveston County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-38. That smaller top-up costs around $1,620 and saves an estimated $108/year — payback about 14.9 years. This one is a genuine toss-up, not a clear yes.
Getting it done in Galveston 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 Galveston County's estimated $805/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.