Bexar County, TX Insulation Payback
Is attic insulation worth it in Bexar County, TX?
Bexar County, Texas is zone 2 under DOE's climate map (Hot-Humid), which means humid heat for much of the year, with cooling running far more than heating ever does. An uninsulated attic there should be built up to R-49. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-49 runs an estimated $2,820, and saves about $882 a year in heating and cooling — a payback around 3.2 years. That is a solid payback as home upgrades go.
Heating vs. cooling in Bexar County
Heating accounts for about $405/year of that and cooling about $477/year — Bexar County needs both. Nationally, Bexar County ranks in the 9th percentile for insulation savings potential. Compared only against its own climate zone, Bexar County places 66th out of 233. Against Texas's own average of $1,035/year, Bexar County runs 15% below that.
Bexar County's actual weather, not a national average
NOAA's SAN ANTONIO INCARNATE WORD, TX US station, 3.2 miles from Bexar County, supplies the 1,527 HDD and 2,995 CDD this estimate runs on. Combined heating and cooling load puts Bexar County in the 12th 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
If Bexar 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 $119/year — payback about 13.6 years. Whether that is worth it depends on how long you plan to stay.
Next steps for a Bexar 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 Bexar County's estimated $882/year on the line.
Bexar County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Bexar 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.