Guadalupe County, TX Insulation Payback
Is attic insulation worth it in Guadalupe County, TX?
Guadalupe 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 $885 a year — payback in roughly 3.2 years. That is a solid payback as home upgrades go.
Heating vs. cooling in Guadalupe County
Heating accounts for about $384/year of that and cooling about $501/year — Guadalupe County needs both. Nationally, Guadalupe County ranks in the 9th percentile for insulation savings potential. Compared only against its own climate zone, Guadalupe County places 61st out of 233. Against Texas's own average of $1,035/year, Guadalupe County runs 14% below that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 1,446 HDD and 3,144 CDD (base 65°F, 1991-2020 normals) — come from AUSTIN SAN ANTONIO, TX US, the nearest NOAA station with published normals, 9.6 miles from Guadalupe County's center. Combined heating and cooling load puts Guadalupe County in the 13th percentile of this 3,162-county dataset. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
If the attic isn't bare
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 $119/year saved (~13.6-year payback). Whether that is worth it depends on how long you plan to stay.
Quotes and materials for this job
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $2,820 as a starting estimate for a Guadalupe County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Guadalupe County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Guadalupe County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.