Sevier County, TN Insulation Payback
Attic insulation payback for Sevier County, TN
DOE classifies Sevier County as climate zone 4, mixed-humid — real heating and real cooling seasons both, roughly balanced across the year. Its recommended attic R-value for bare joists is R-60. Going from R-2 to the recommended R-60 costs roughly $3,480 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2.7 years at an estimated $1,272/year saved. Hard to find a home improvement with a faster payback than this.
Heating vs. cooling in Sevier County
Of that, about $1,145/year comes from reduced heating and $127/year from reduced cooling load through the ceiling. Sevier County beats 36% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 825 counties DOE places in zone 4, Sevier County ranks 636th. Against Tennessee's own average of $1,258/year, Sevier County runs 1% above that.
Sevier County's actual weather, not a national average
Sevier County's climate figures — 4,284 heating and 789 cooling degree days a year — are read from GATLINBURG 2 SW, TN US, 6.9 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Sevier County 2283rd nationally by total degree days — the 28th percentile. DOE also classifies Sevier County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
If the attic isn't bare
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $186/year saved — roughly 12.3 years to break even. 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 Sevier County's estimated $1,272/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.