Van Zandt County, TX Insulation Payback
Van Zandt County attic insulation, by the numbers
DOE classifies Van Zandt County as climate zone 3, hot-humid — long, muggy summers and mild winters, where cooling dominates the energy bill. 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 $1,049 a year in heating and cooling — a payback around 2.7 years. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $644 a year on the heating side, $405 on cooling. By estimated insulation savings, Van Zandt County lands in the 20th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Van Zandt County comes in 363rd by savings. Texas averages $1,035/year across the counties tracked here; Van Zandt County comes in 1% higher.
The climate data behind this
NOAA's WILLS PT, TX US station, 14.3 miles from Van Zandt County, supplies the 2,428 HDD and 2,541 CDD this estimate runs on. By total degree days, Van Zandt County sits at the 25th percentile nationally. One local detail the R-value alone won't tell you: Van Zandt County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
The smaller top-up scenario
If Van Zandt County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-38. That smaller top-up costs around $1,620 and saves an estimated $141/year — payback about 11.5 years. Call this borderline rather than a clear win.
Quotes and materials for this job
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 Van Zandt County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Van Zandt 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.