La Salle County, TX Insulation Payback
La Salle County, TX: what topping up your attic actually costs
DOE classifies La Salle County as climate zone 2, 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. 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 3.1 years at an estimated $896/year saved. The math clears comfortably within a normal ownership horizon.
Where the savings come from
The estimated savings split roughly $266/year heating, $630/year cooling. Out of every 100 US counties tracked here, La Salle County's savings potential beats roughly 10 of them. Within zone 2 specifically, it ranks 46th of 233 counties by estimated savings. Texas averages $1,035/year across the counties tracked here; La Salle County comes in 13% lower.
Where these numbers come from
NOAA's COTULLA LA SALLE CO AP, TX US station, 10.4 miles from La Salle County, supplies the 1,004 HDD and 3,951 CDD this estimate runs on. By total degree days, La Salle County sits at the 25th percentile nationally. La Salle County falls in DOE's moisture regime B (dry), a detail that affects vapor-barrier recommendations more than the R-value target itself.
Already have some insulation?
A shallower starting point changes the math: with R-11 already down, only the gap to R-38 needs filling, at roughly $1,620 for an estimated $121/year saved (~13.4-year payback). This one is a genuine toss-up, not a clear yes.
Getting it done in La Salle County
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 La Salle County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-49 is the target here specifically.