Greene County, MS Insulation Payback
Is attic insulation worth it in Greene County, MS?
Greene County sits in IECC climate zone 3 (Hot-Humid) — summers that stay hot and humid while winters barely register on 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 years at an estimated $926/year saved. That is a solid payback as home upgrades go.
Where the savings come from
Heating accounts for about $527/year of that and cooling about $399/year — Greene County needs both. Nationally, Greene County ranks in the 11th percentile for insulation savings potential. Compared only against its own climate zone, Greene County places 617th out of 690. Against Mississippi's own average of $1,022/year, Greene County runs 9% below that.
The climate data behind this
NOAA's BEAUMONT EXPSTATION, MS US station, 16.8 miles from Greene County, supplies the 1,987 HDD and 2,501 CDD this estimate runs on. That combined heating-and-cooling load ranks Greene County 2817th nationally by total degree days — the 11th percentile. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
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 $125/year saved (~13-year payback). Whether that is worth it depends on how long you plan to stay.
Next steps for a Greene 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 Greene County's estimated $926/year on the line.
Greene County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Greene County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.