Hinds County, MS Insulation Payback
Attic insulation payback for Hinds County, MS
Hinds County, Mississippi is zone 3 under DOE's climate map (Hot-Humid), which means summers that stay hot and humid while winters barely register on the energy bill. An uninsulated attic there should be built up to 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 2.9 years at an estimated $979/year saved. Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $593/year comes from reduced heating and $386/year from reduced cooling load through the ceiling. Hinds County beats 15% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 690 counties DOE places in zone 3, Hinds County ranks 512th. Against Mississippi's own average of $1,022/year, Hinds County runs 4% below that.
Where these numbers come from
Hinds County's climate figures — 2,234 heating and 2,425 cooling degree days a year — are read from OAKLEY EXP STN, MS US, 5.1 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Hinds County sits at the 15th percentile nationally. DOE also classifies Hinds 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
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 $132/year saved (~12.3-year payback). It is close - the payback only just fits a reasonable timeframe.
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 Hinds County's estimated $979/year on the line.
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.