San Patricio County, TX Insulation Payback
Attic insulation payback for San Patricio County, TX
San Patricio 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. 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 $813 a year in heating and cooling — a payback around 3.5 years. Worth doing on the numbers alone.
Heating vs. cooling in San Patricio County
Of that, about $268/year comes from reduced heating and $545/year from reduced cooling load through the ceiling. San Patricio County beats 5% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 233 counties DOE places in zone 2, San Patricio County ranks 160th. Against Texas's own average of $1,035/year, San Patricio County runs 21% below that.
The climate data behind this
NOAA's SINTON, TX US station, 2.6 miles from San Patricio County, supplies the 1,011 HDD and 3,419 CDD this estimate runs on. By total degree days, San Patricio County sits at the 9th percentile nationally. DOE also classifies San Patricio County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $110/year saved — roughly 14.8 years to break even. It is close - the payback only just fits a reasonable timeframe.
Getting it done in San Patricio County
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 San Patricio County's estimated $813/year on the line.
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.