Jefferson Davis County, MS Insulation Payback
Is attic insulation worth it in Jefferson Davis County, MS?
Jefferson Davis County, Mississippi is zone 3 under DOE's climate map (Hot-Humid), which means humid heat for much of the year, with cooling running far more than heating ever does. An uninsulated attic there should be built up to 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 $937 a year in heating and cooling — a payback around 3 years. That is a solid payback as home upgrades go.
Where the savings come from
Heating accounts for about $502/year of that and cooling about $434/year — Jefferson Davis County needs both. Nationally, Jefferson Davis County ranks in the 12th percentile for insulation savings potential. Compared only against its own climate zone, Jefferson Davis County places 600th out of 690. Against Mississippi's own average of $1,022/year, Jefferson Davis County runs 8% below that.
Jefferson Davis County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 1,893 HDD and 2,726 CDD (base 65°F, 1991-2020 normals) — come from MONTICELLO, MS US, the nearest NOAA station with published normals, 16.4 miles from Jefferson Davis County's center. That combined heating-and-cooling load ranks Jefferson Davis County 2714th nationally by total degree days — the 14th 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 $126/year saved (~12.8-year payback). Whether that is worth it depends on how long you plan to stay.
Next steps for a Jefferson Davis County attic
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $2,820 as a starting estimate for a Jefferson Davis County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Jefferson Davis County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Jefferson Davis 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.