Laurel County, KY Insulation Payback
Laurel County, KY: what topping up your attic actually costs
DOE classifies Laurel 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. Going from R-2 to the recommended R-60 costs roughly $3,480 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2.7 years at an estimated $1,307/year saved. That's about as fast as attic paybacks get.
Heating vs. cooling in Laurel County
The estimated savings split roughly $1,112/year heating, $196/year cooling. Out of every 100 US counties tracked here, Laurel County's savings potential beats roughly 39 of them. Within zone 4 specifically, it ranks 567th of 825 counties by estimated savings. Kentucky averages $1,385/year across the counties tracked here; Laurel County comes in 6% lower.
Where these numbers come from
Laurel County's climate figures — 4,158 heating and 1,218 cooling degree days a year — are read from LONDON CORBIN AP, KY US, 3 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Laurel County 2001st nationally by total degree days — the 37th percentile. Laurel 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 Laurel 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 $191/year — payback about 12 years. This one is a genuine toss-up, not a clear yes.
Getting it done in Laurel County
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 Laurel 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.