Letcher County, KY Insulation Payback
Letcher County attic insulation, by the numbers
Letcher County, Kentucky is zone 4 under DOE's climate map (Mixed-Humid), which means a genuine mix of cold winters and humid summers, with neither one dominating the bill. 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 $1,380 a year in heating and cooling — a payback around 2.5 years. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $1,266 a year on the heating side, $114 on cooling. By estimated insulation savings, Letcher County lands in the 44th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Letcher County comes in 425th by savings. Kentucky averages $1,385/year across the counties tracked here; Letcher County comes in 0% higher.
Where these numbers come from
NOAA's WHITESBURG 2SE, KY US station, 3.3 miles from Letcher County, supplies the 4,734 HDD and 712 CDD this estimate runs on. That combined heating-and-cooling load ranks Letcher County 1943rd nationally by total degree days — the 39th percentile. One local detail the R-value alone won't tell you: Letcher County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
The smaller top-up scenario
If Letcher 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 $201/year — payback about 11.3 years. Call this borderline rather than a clear win.
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 Letcher County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Letcher County's R-60 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-60 is the target here specifically.