Runnels County, TX Insulation Payback
Runnels County attic insulation, by the numbers
Runnels County, Texas is zone 3 under DOE's climate map (Hot-Dry), which means scorching, dry summers where heat radiating straight through the roof does most of the damage. 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 $1,045 a year — payback in roughly 2.7 years. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $651 a year on the heating side, $395 on cooling. By estimated insulation savings, Runnels County lands in the 20th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Runnels County comes in 370th by savings. Texas averages $1,035/year across the counties tracked here; Runnels County comes in 1% higher.
The climate data behind this
NOAA's BALLINGER 2 NW, TX US station, 7.2 miles from Runnels County, supplies the 2,453 HDD and 2,476 CDD this estimate runs on. Combined heating and cooling load puts Runnels County in the 24th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Runnels County sits in moisture regime B (dry), which can affect the vapor-barrier choice.
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 $141/year saved — roughly 11.5 years to break even. Call this borderline rather than a clear win.
Next steps for a Runnels County attic
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 Runnels County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Runnels County's R-49 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-49 is the target here specifically.