Stone County, MS Insulation Payback
Stone County attic insulation, by the numbers
Stone County sits in IECC climate zone 2 (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. 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 $870 a year in heating and cooling — a payback around 3.2 years. Topping up the attic pays for itself here.
Heating vs. cooling in Stone County
Split it out and it's roughly $502 a year on the heating side, $368 on cooling. By estimated insulation savings, Stone County lands in the 8th percentile nationally. Zone 2 alone covers 233 counties in this dataset, and Stone County comes in 86th by savings. Mississippi averages $1,022/year across the counties tracked here; Stone County comes in 15% lower.
Stone County's actual weather, not a national average
NOAA's WIGGINS, MS US station, 5.6 miles from Stone County, supplies the 1,893 HDD and 2,306 CDD this estimate runs on. By total degree days, Stone County sits at the 4th percentile nationally. One local detail the R-value alone won't tell you: Stone County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
The smaller top-up scenario
If Stone 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 $117/year — payback about 13.8 years. Call this borderline rather than a clear win.
Getting it done in Stone County
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 Stone County's estimated $870/year on the line.
Where these figures come from
Stone County's R-49 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-49 is the target here specifically.