Webb County, TX Insulation Payback
Attic insulation payback for Webb County, TX
Webb County, Texas is zone 2 under DOE's climate map (Hot-Humid), which means long, muggy summers and mild winters, where cooling dominates 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 $871 a year — payback in roughly 3.2 years. Worth doing on the numbers alone.
The breakdown behind the number
Of that, about $296/year comes from reduced heating and $575/year from reduced cooling load through the ceiling. Webb County beats 8% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 233 counties DOE places in zone 2, Webb County ranks 83rd. Against Texas's own average of $1,035/year, Webb County runs 16% below that.
Where these numbers come from
Webb County's climate figures — 1,115 heating and 3,606 cooling degree days a year — are read from ENCINAL, TX US, 15.2 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Webb County in the 18th percentile of this 3,162-county dataset. DOE also classifies Webb County as moisture regime B (dry) - ask a local contractor whether that changes the vapor-barrier approach for this job.
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 $117/year saved (~13.8-year payback). It is close - the payback only just fits a reasonable timeframe.
Getting it done in Webb County
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $2,820 figure above as a planning number for Webb County, not a bid - contractors typically charge a $600 minimum regardless of job size.
More on how this was built
Nothing here is a guess: the methodology guide names the DOE climate map and NOAA station data behind every number on this page. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.