Calhoun County, TX Insulation Payback
Attic insulation payback for Calhoun County, TX
Calhoun County, Texas is zone 2 under DOE's climate map (Hot-Humid), which means summers that stay hot and humid while winters barely register on 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 $767 a year — payback in roughly 3.7 years. Worth doing on the numbers alone.
The breakdown behind the number
Of that, about $241/year comes from reduced heating and $526/year from reduced cooling load through the ceiling. Calhoun County beats 3% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 233 counties DOE places in zone 2, Calhoun County ranks 195th. Against Texas's own average of $1,035/year, Calhoun County runs 26% below that.
The climate data behind this
The heating and cooling degree days behind this estimate — 908 HDD and 3,301 CDD (base 65°F, 1991-2020 normals) — come from PORT O'CONNOR, TX US, the nearest NOAA station with published normals, 9.2 miles from Calhoun County's center. That combined heating-and-cooling load ranks Calhoun County 3018th nationally by total degree days — the 5th percentile. DOE also classifies Calhoun 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
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 $103/year saved (~15.7-year payback). It is close - the payback only just fits a reasonable timeframe.
Quotes and materials for this job
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 Calhoun 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.