Mineral County, WV Insulation Payback
Mineral County, WV: what topping up your attic actually costs
DOE classifies Mineral 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. 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 $1,595 a year in heating and cooling — a payback around 2.2 years. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $1,449/year heating, $146/year cooling. Out of every 100 US counties tracked here, Mineral County's savings potential beats roughly 59 of them. Within zone 5 specifically, it ranks 646th of 745 counties by estimated savings. West Virginia averages $1,526/year across the counties tracked here; Mineral County comes in 5% higher.
Where these numbers come from
Mineral County's climate figures — 5,421 heating and 907 cooling degree days a year — are read from KEYSER 2 SSW, WV US, 2.8 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Mineral County sits at the 59th percentile nationally. Mineral County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
Already have some insulation?
If Mineral 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 $233/year — payback about 9.8 years. This one is a genuine toss-up, not a clear yes.
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 Mineral County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-60 is the target here specifically.