Zavala County, TX Insulation Payback
Zavala County attic insulation, by the numbers
Zavala County sits in IECC climate zone 2 (Hot-Humid) — summers that stay hot and humid while winters barely register on the energy bill. For a currently uninsulated attic, DOE and ENERGY STAR recommend building 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 $874 a year in heating and cooling — a payback around 3.2 years. Topping up the attic pays for itself here.
Heating vs. cooling in Zavala County
Split it out and it's roughly $263 a year on the heating side, $612 on cooling. By estimated insulation savings, Zavala County lands in the 8th percentile nationally. Zone 2 alone covers 233 counties in this dataset, and Zavala County comes in 79th by savings. Texas averages $1,035/year across the counties tracked here; Zavala County comes in 16% lower.
Where these numbers come from
Zavala County's climate figures — 990 heating and 3,838 cooling degree days a year — are read from CRYSTAL CITY, TX US, 13.5 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Zavala County 2517th nationally by total degree days — the 20th percentile. One local detail the R-value alone won't tell you: Zavala 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 $118/year saved — roughly 13.8 years to break even. Call this borderline rather than a clear win.
Next steps for a Zavala 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 Zavala County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Zavala 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.