Jefferson County, WV Insulation Payback
Jefferson County, WV: what topping up your attic actually costs
Jefferson County, West Virginia is zone 4 under DOE's climate map (Mixed-Humid), which means heating load in winter and cooling load in summer, both worth taking seriously here. 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 $1,485 a year in heating and cooling — a payback around 2.3 years. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $1,323/year heating, $163/year cooling. Out of every 100 US counties tracked here, Jefferson County's savings potential beats roughly 52 of them. Within zone 4 specifically, it ranks 200th of 825 counties by estimated savings. West Virginia averages $1,526/year across the counties tracked here; Jefferson County comes in 3% lower.
The climate data behind this
NOAA's MARTINSBURG E WV RGNL AP, WV US station, 9.2 miles from Jefferson County, supplies the 4,947 HDD and 1,013 CDD this estimate runs on. Combined heating and cooling load puts Jefferson County in the 51th percentile of this 3,162-county dataset. Jefferson County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
If the attic isn't bare
A shallower starting point changes the math: with R-11 already down, only the gap to R-49 needs filling, at roughly $2,280 for an estimated $217/year saved (~10.5-year payback). This one is a genuine toss-up, not a clear yes.
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 Jefferson County's estimated $1,485/year on the line.
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.