Ascension Parish, LA Insulation Payback
Ascension Parish attic insulation, by the numbers
Ascension Parish sits in IECC climate zone 2 (Hot-Humid) — long, muggy summers and mild winters, where cooling dominates the energy bill. For a currently uninsulated attic, DOE and ENERGY STAR recommend building 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 3.4 years at an estimated $836/year saved. Topping up the attic pays for itself here.
The breakdown behind the number
Split it out and it's roughly $405 a year on the heating side, $431 on cooling. By estimated insulation savings, Ascension Parish lands in the 6th percentile nationally. Zone 2 alone covers 233 counties in this dataset, and Ascension Parish comes in 136th by savings. Louisiana averages $906/year across the counties tracked here; Ascension Parish comes in 8% lower.
Ascension Parish's actual weather, not a national average
Ascension Parish's climate figures — 1,526 heating and 2,705 cooling degree days a year — are read from DONALDSONVILLE 4 SW, LA US, 11.6 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Ascension Parish in the 5th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Ascension Parish sits in moisture regime A (humid), which can affect the vapor-barrier choice.
If the attic isn't bare
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 $113/year saved (~14.4-year payback). Call this borderline rather than a clear win.
Getting it done in Ascension Parish
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 Ascension Parish's estimated $836/year on the line.
Where these figures come from
Ascension 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.