Waller County, TX Insulation Payback
Waller County attic insulation, by the numbers
Waller County, Texas is zone 2 under DOE's climate map (Hot-Humid), which means long, muggy summers and mild winters, where cooling dominates the energy bill. An uninsulated attic there should be built up to R-49. Going from R-2 to the recommended R-49 costs roughly $2,820 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 3.2 years at an estimated $885/year saved. Topping up the attic pays for itself here.
The breakdown behind the number
Split it out and it's roughly $414 a year on the heating side, $471 on cooling. By estimated insulation savings, Waller County lands in the 9th percentile nationally. Zone 2 alone covers 233 counties in this dataset, and Waller County comes in 62nd by savings. Texas averages $1,035/year across the counties tracked here; Waller County comes in 14% lower.
Where these numbers come from
The heating and cooling degree days behind this estimate — 1,559 HDD and 2,956 CDD (base 65°F, 1991-2020 normals) — come from BELLVILLE 6NNE, TX US, the nearest NOAA station with published normals, 14.1 miles from Waller County's center. Combined heating and cooling load puts Waller County in the 12th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Waller County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
If the attic isn't bare
If Waller 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 $119/year — payback about 13.6 years. Call this borderline rather than a clear win.
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 Waller County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Waller 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.