Coryell County, TX Insulation Payback
Attic insulation payback for Coryell County, TX
Coryell 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 $974 a year in heating and cooling — a payback around 2.9 years. Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $553/year comes from reduced heating and $421/year from reduced cooling load through the ceiling. Coryell County beats 15% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 233 counties DOE places in zone 2, Coryell County ranks 10th. Against Texas's own average of $1,035/year, Coryell County runs 6% below that.
Coryell County's actual weather, not a national average
NOAA's GATESVILLE, TX US station, 5.9 miles from Coryell County, supplies the 2,083 HDD and 2,643 CDD this estimate runs on. Combined heating and cooling load puts Coryell County in the 18th percentile of this 3,162-county dataset. DOE also classifies Coryell County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
The smaller top-up scenario
If Coryell 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 $131/year — payback about 12.4 years. It is close - the payback only just fits a reasonable timeframe.
Next steps for a Coryell County attic
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 Coryell 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.