Newton County, MS Insulation Payback
Newton County attic insulation, by the numbers
Newton County, Mississippi is zone 3 under DOE's climate map (Mixed-Humid), which means a genuine mix of cold winters and humid summers, with neither one dominating the bill. 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 $1,002 a year in heating and cooling — a payback around 2.8 years. Topping up the attic pays for itself fast here.
Heating vs. cooling in Newton County
Split it out and it's roughly $655 a year on the heating side, $347 on cooling. By estimated insulation savings, Newton County lands in the 17th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Newton County comes in 469th by savings. Mississippi averages $1,022/year across the counties tracked here; Newton County comes in 2% lower.
Where these numbers come from
The heating and cooling degree days behind this estimate — 2,469 HDD and 2,175 CDD (base 65°F, 1991-2020 normals) — come from NEWTON EXP STN, MS US, the nearest NOAA station with published normals, 4.9 miles from Newton County's center. By total degree days, Newton County sits at the 15th percentile nationally. One local detail the R-value alone won't tell you: Newton County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
Already have some insulation?
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 $135/year saved (~12-year payback). Call this borderline rather than a clear win.
Quotes and materials for this job
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 Newton County's estimated $1,002/year on the line.
Where these figures come from
Newton 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.