Hamilton County, TX Insulation Payback
Attic insulation payback for Hamilton County, TX
DOE classifies Hamilton County as climate zone 3, hot-humid — summers that stay hot and humid while winters barely register on the energy bill. 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 2.8 years at an estimated $1,005/year saved. Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $606/year comes from reduced heating and $398/year from reduced cooling load through the ceiling. Hamilton County beats 17% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 690 counties DOE places in zone 3, Hamilton County ranks 463rd. Against Texas's own average of $1,035/year, Hamilton County runs 3% below that.
Where these numbers come from
NOAA's EVANT 1SSW, TX US station, 17.2 miles from Hamilton County, supplies the 2,285 HDD and 2,499 CDD this estimate runs on. That combined heating-and-cooling load ranks Hamilton County 2555th nationally by total degree days — the 19th percentile. DOE also classifies Hamilton 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
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $135/year saved — roughly 12 years to break even. It is close - the payback only just fits a reasonable timeframe.
Next steps for a Hamilton 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 Hamilton 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.