Preston County, WV Insulation Payback
Attic insulation payback for Preston County, WV
DOE classifies Preston County as climate zone 5, cold — a real winter that drives most of the annual energy bill here. Its recommended attic R-value for bare joists is 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 $1,799 a year in heating and cooling — a payback around 1.9 years. Hard to find a home improvement with a faster payback than this.
The breakdown behind the number
Of that, about $1,755/year comes from reduced heating and $44/year from reduced cooling load through the ceiling. Preston County beats 72% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 745 counties DOE places in zone 5, Preston County ranks 295th. Against West Virginia's own average of $1,526/year, Preston County runs 18% above that.
Where these numbers come from
NOAA's TERRA ALTA #1, WV US station, 6.7 miles from Preston County, supplies the 6,562 HDD and 276 CDD this estimate runs on. That combined heating-and-cooling load ranks Preston County 1011th nationally by total degree days — the 68th percentile. DOE also classifies Preston County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
Already have some insulation?
If Preston 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 $262/year — payback about 8.7 years. It is close - the payback only just fits a reasonable timeframe.
Quotes and materials for this job
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $3,480 figure above as a planning number for Preston County, not a bid - contractors typically charge a $600 minimum regardless of job size.
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.