Iberville Parish, LA Insulation Payback
Attic insulation payback for Iberville Parish, LA
DOE classifies Iberville Parish as climate zone 2, hot-humid — summers that stay hot and humid while winters barely register on 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 $858 a year in heating and cooling — a payback around 3.3 years.
Worth doing on the numbers alone.
Heating vs. cooling in Iberville Parish
Of that, about $449/year comes from reduced heating and $408/year from reduced cooling load through the ceiling. Iberville Parish beats 7% of the counties in this 3,171-county dataset on estimated insulation savings. Among the 233 counties DOE places in zone 2, Iberville Parish ranks 100th. Against Louisiana's own average of $906/year, Iberville Parish runs 5% below that.
The climate data behind this
Iberville Parish's climate figures — 1,693 heating and 2,563 cooling degree days a year — are read from Brusly 2 W, LA US, 10.1 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Iberville Parish 3000th nationally by total degree days — the 5th percentile. DOE also classifies Iberville Parish as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
If the attic isn't bare
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $116/year saved — roughly 14 years to break even. It is close - the payback only just fits a reasonable timeframe.
Getting it done in Iberville Parish
Get quotes from at least two local contractors 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 checking upfront given Iberville Parish's estimated $858/year on the line.
More on how this was built
Nothing here is a guess: the methodology guide names the DOE climate map and NOAA station data behind every number on this page. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.