Madison Parish, LA Insulation Payback
Madison Parish attic insulation, by the numbers
Madison Parish, Louisiana is zone 3 under DOE's climate map (Hot-Humid), which means summers that stay hot and humid while winters barely register on 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 2.9 years at an estimated $957/year saved. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $502 a year on the heating side, $455 on cooling. By estimated insulation savings, Madison Parish lands in the 14th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Madison Parish comes in 559th by savings. Louisiana averages $906/year across the counties tracked here; Madison Parish comes in 6% higher.
Madison Parish's actual weather, not a national average
Madison Parish's climate figures — 1,893 heating and 2,856 cooling degree days a year — are read from TALLULAH, LA US, 4.6 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Madison Parish 2580th nationally by total degree days — the 18th percentile. One local detail the R-value alone won't tell you: Madison Parish sits in moisture regime A (humid), which can affect the vapor-barrier choice.
If the attic isn't bare
If Madison Parish'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 $129/year — payback about 12.6 years. Call this borderline rather than a clear win.
Next steps for a Madison Parish attic
Get more than one quote before committing. Attic access and any needed air sealing move the price around, and most contractors won't take a job below roughly $600 regardless of size - worth asking upfront given Madison Parish's estimated $957/year on the line.
Where these figures come from
Madison Parish'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.