Wilkinson County, MS Insulation Payback
Attic insulation payback for Wilkinson County, MS
Wilkinson County sits in IECC climate zone 3 (Hot-Humid) — humid heat for much of the year, with cooling running far more than heating ever does. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-49. For an attic around 1,000 square feet, closing the gap from R-2 to R-49 costs around $2,820 and saves an estimated $886 a year — payback in roughly 3.2 years. Worth doing on the numbers alone.
Where the savings come from
Of that, about $503/year comes from reduced heating and $383/year from reduced cooling load through the ceiling. Wilkinson County beats 9% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 690 counties DOE places in zone 3, Wilkinson County ranks 653rd. Against Mississippi's own average of $1,022/year, Wilkinson County runs 13% below that.
Wilkinson County's actual weather, not a national average
Wilkinson County's climate figures — 1,894 heating and 2,405 cooling degree days a year — are read from WOODVILLE 4 ESE, MS US, 7.2 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Wilkinson County 2956th nationally by total degree days — the 7th percentile. DOE also classifies Wilkinson County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
The smaller top-up scenario
If Wilkinson 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 $119/year — payback about 13.6 years. It is close - the payback only just fits a reasonable timeframe.
Next steps for a Wilkinson County attic
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $2,820 figure above as a planning number for Wilkinson County, not a bid - contractors typically charge a $600 minimum regardless of job size.
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.