Benton County, TN Insulation Payback
Attic insulation payback for Benton County, TN
Benton County, Tennessee is zone 4 under DOE's climate map (Mixed-Humid), which means real heating and real cooling seasons both, roughly balanced across the year. An uninsulated attic there should be built up to R-60. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-60 runs an estimated $3,480, and saves about $1,221 a year in heating and cooling — a payback around 2.9 years. Hard to find a home improvement with a faster payback than this.
Heating vs. cooling in Benton County
Of that, about $943/year comes from reduced heating and $278/year from reduced cooling load through the ceiling. Benton County beats 33% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 825 counties DOE places in zone 4, Benton County ranks 721st. Against Tennessee's own average of $1,258/year, Benton County runs 3% below that.
Where these numbers come from
Benton County's climate figures — 3,526 heating and 1,732 cooling degree days a year — are read from CAMDEN, TN US, 1.5 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Benton County 2125th nationally by total degree days — the 33th percentile. DOE also classifies Benton 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
If Benton County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-49. That smaller top-up costs around $2,280 and saves an estimated $178/year — payback about 12.8 years. 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 Benton County's estimated $1,221/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.