Grayson County, KY Insulation Payback
Grayson County attic insulation, by the numbers
DOE classifies Grayson County as climate zone 4, mixed-humid — real heating and real cooling seasons both, roughly balanced across the year. Its recommended attic R-value for bare joists is R-60. For an attic around 1,000 square feet, closing the gap from R-2 to R-60 costs around $3,480 and saves an estimated $1,495 a year — payback in roughly 2.3 years. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $1,340 a year on the heating side, $156 on cooling. By estimated insulation savings, Grayson County lands in the 53th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Grayson County comes in 181st by savings. Kentucky averages $1,385/year across the counties tracked here; Grayson County comes in 8% higher.
Where these numbers come from
Grayson County's climate figures — 5,010 heating and 969 cooling degree days a year — are read from LEITCHFIELD 2 N, KY US, 4.7 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Grayson County in the 51th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Grayson County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
The smaller top-up scenario
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 $218/year saved (~10.5-year payback). 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 Grayson County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Grayson 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.