Greenbrier County, WV Insulation Payback
Attic insulation payback for Greenbrier County, WV
DOE classifies Greenbrier County as climate zone 5, cold — cold enough that heating, not cooling, is what decides the bill. 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 2.1 years at an estimated $1,624/year saved.
Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $1,534/year comes from reduced heating and $90/year from reduced cooling load through the ceiling. Greenbrier County beats 61% of the counties in this 3,171-county dataset on estimated insulation savings. Among the 754 counties DOE places in zone 5, Greenbrier County ranks 615th. Against West Virginia's own average of $1,526/year, Greenbrier County runs 6% above that.
Greenbrier County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 5,737 HDD and 563 CDD (base 65°F, 1991-2020 normals) — come from Lewisburg 3 N, WV US, the nearest NOAA station with published normals, 5.3 miles from Greenbrier County's center. Combined heating and cooling load puts Greenbrier County in the 58th percentile of this 3,171-county dataset. DOE also classifies Greenbrier 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 Greenbrier 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 $237/year — payback about 9.6 years. It is close - the payback only just fits a reasonable timeframe.
Getting it done in Greenbrier County
Get quotes from at least two local contractors 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 checking upfront given Greenbrier County's estimated $1,624/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.