Robertson County, TX Insulation Payback
Is attic insulation worth it in Robertson County, TX?
Robertson County sits in IECC climate zone 2 (Hot-Humid) — humid heat for much of the year, with cooling running far more than heating ever does. For a currently uninsulated attic, DOE and ENERGY STAR recommend building 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 $924 a year in heating and cooling — a payback around 3.1 years. That is a solid payback as home upgrades go.
The breakdown behind the number
Heating accounts for about $468/year of that and cooling about $456/year — Robertson County needs both. Nationally, Robertson County ranks in the 11th percentile for insulation savings potential. Compared only against its own climate zone, Robertson County places 28th out of 233. Against Texas's own average of $1,035/year, Robertson County runs 11% below that.
Robertson County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 1,764 HDD and 2,864 CDD (base 65°F, 1991-2020 normals) — come from FRANKLIN, TX US, the nearest NOAA station with published normals, 1.6 miles from Robertson County's center. That combined heating-and-cooling load ranks Robertson County 2705th nationally by total degree days — the 14th percentile. 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 $125/year saved (~13-year payback). Whether that is worth it depends on how long you plan to stay.
Next steps for a Robertson 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 Robertson County's estimated $924/year on the line.
Robertson County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Robertson 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.