McCulloch County, TX Insulation Payback
Attic insulation payback for McCulloch County, TX
DOE classifies McCulloch County as climate zone 3, hot-dry — desert-dry heat for much of the year, with the attic taking the brunt of it. Its recommended attic R-value for bare joists is R-49. Going from R-2 to the recommended R-49 costs roughly $2,820 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2.9 years at an estimated $978/year saved. Hard to find a home improvement with a faster payback than this.
The breakdown behind the number
Of that, about $592/year comes from reduced heating and $386/year from reduced cooling load through the ceiling. McCulloch County beats 15% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 690 counties DOE places in zone 3, McCulloch County ranks 520th. Against Texas's own average of $1,035/year, McCulloch County runs 6% below that.
McCulloch County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 2,231 HDD and 2,420 CDD (base 65°F, 1991-2020 normals) — come from BRADY, TX US, the nearest NOAA station with published normals, 4.3 miles from McCulloch County's center. Combined heating and cooling load puts McCulloch County in the 15th percentile of this 3,162-county dataset. DOE also classifies McCulloch County as moisture regime B (dry) - ask a local contractor whether that changes the vapor-barrier approach for this job.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $132/year saved — roughly 12.3 years to break even. 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 McCulloch 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.