Perry County, MS Insulation Payback
Attic insulation payback for Perry County, MS
Perry County, Mississippi 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 3 years at an estimated $926/year saved. Worth doing on the numbers alone.
Where the savings come from
Of that, about $527/year comes from reduced heating and $399/year from reduced cooling load through the ceiling. Perry County beats 11% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 690 counties DOE places in zone 3, Perry County ranks 618th. Against Mississippi's own average of $1,022/year, Perry County runs 9% below that.
The climate data behind this
The heating and cooling degree days behind this estimate — 1,987 HDD and 2,501 CDD (base 65°F, 1991-2020 normals) — come from BEAUMONT EXPSTATION, MS US, the nearest NOAA station with published normals, 6.2 miles from Perry County's center. Combined heating and cooling load puts Perry County in the 11th percentile of this 3,162-county dataset. DOE also classifies Perry County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
Already have some insulation?
If Perry 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 $125/year — payback about 13 years. It is close - the payback only just fits a reasonable timeframe.
Next steps for a Perry County 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 Perry County's estimated $926/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.