Sterling County, TX Insulation Payback
Attic insulation payback for Sterling County, TX
DOE classifies Sterling County as climate zone 3, hot-dry — intense summer heat with low humidity, where attic radiant heat gain is the main driver. Its recommended attic R-value for bare joists is 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 $1,082 a year in heating and cooling — a payback around 2.6 years. Hard to find a home improvement with a faster payback than this.
Heating vs. cooling in Sterling County
Of that, about $725/year comes from reduced heating and $357/year from reduced cooling load through the ceiling. Sterling County beats 23% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 690 counties DOE places in zone 3, Sterling County ranks 286th. Against Texas's own average of $1,035/year, Sterling County runs 5% above that.
The climate data behind this
The heating and cooling degree days behind this estimate — 2,733 HDD and 2,237 CDD (base 65°F, 1991-2020 normals) — come from STERLING CITY, TX US, the nearest NOAA station with published normals, 4.2 miles from Sterling County's center. Combined heating and cooling load puts Sterling County in the 25th percentile of this 3,162-county dataset. DOE also classifies Sterling County as moisture regime B (dry) - ask a local contractor whether that changes the vapor-barrier approach for this job.
If the attic isn't bare
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $146/year saved — roughly 11.1 years to break even. It is close - the payback only just fits a reasonable timeframe.
Quotes and materials for this job
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $2,820 as a starting estimate for a Sterling County job, not a quote. Expect at least a $600 minimum charge from most contractors.
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.