Bolivar County, MS Insulation Payback
Bolivar County attic insulation, by the numbers
DOE classifies Bolivar County as climate zone 3, mixed-humid — real heating and real cooling seasons both, roughly balanced across the year. Its recommended attic R-value for bare joists is 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 2.5 years at an estimated $1,121/year saved. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $749 a year on the heating side, $372 on cooling. By estimated insulation savings, Bolivar County lands in the 26th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Bolivar County comes in 206th by savings. Mississippi averages $1,022/year across the counties tracked here; Bolivar County comes in 10% higher.
Where these numbers come from
Bolivar County's climate figures — 2,824 heating and 2,333 cooling degree days a year — are read from CLEVELAND, MS US, 9.1 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Bolivar County 2213th nationally by total degree days — the 30th percentile. One local detail the R-value alone won't tell you: Bolivar 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 $151/year saved (~10.7-year payback). Call this borderline rather than a clear win.
Next steps for a Bolivar 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 Bolivar County's estimated $1,121/year on the line.
Where these figures come from
Bolivar 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.