Fort Bend County, TX Insulation Payback
Fort Bend County, TX: what topping up your attic actually costs
Fort Bend County, Texas is zone 2 under DOE's climate map (Hot-Humid), which means summers that stay hot and humid while winters barely register on the energy bill. An uninsulated attic there should be built up to 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 $824 a year — payback in roughly 3.4 years. The math clears comfortably within a normal ownership horizon.
Heating vs. cooling in Fort Bend County
The estimated savings split roughly $350/year heating, $473/year cooling. Out of every 100 US counties tracked here, Fort Bend County's savings potential beats roughly 5 of them. Within zone 2 specifically, it ranks 144th of 233 counties by estimated savings. Texas averages $1,035/year across the counties tracked here; Fort Bend County comes in 20% lower.
The climate data behind this
Fort Bend County's climate figures — 1,320 heating and 2,971 cooling degree days a year — are read from THOMPSONS 3 WSW, TX US, 8.9 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Fort Bend County 2963rd nationally by total degree days — the 6th percentile. Fort Bend County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
The smaller top-up scenario
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 $111/year saved (~14.6-year payback). This one is a genuine toss-up, not a clear yes.
Quotes and materials for this job
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 Fort Bend County's estimated $824/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.