Lyon County, KY Insulation Payback
Is attic insulation worth it in Lyon County, KY?
Lyon 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. 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 $1,202 a year — payback in roughly 2.9 years. Few home upgrades pay back that quickly.
Where the savings come from
Heating accounts for about $897/year of that and cooling about $305/year — Lyon County needs both. Nationally, Lyon County ranks in the 31th percentile for insulation savings potential. Compared only against its own climate zone, Lyon County places 745th out of 825. Against Kentucky's own average of $1,385/year, Lyon County runs 13% below that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 3,354 HDD and 1,902 CDD (base 65°F, 1991-2020 normals) — come from EDDYVILLE 5S, KY US, the nearest NOAA station with published normals, 1.8 miles from Lyon County's center. That combined heating-and-cooling load ranks Lyon County 2127th nationally by total degree days — the 33th percentile. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
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 $175/year saved (~13-year payback). Whether that is worth it depends on how long you plan to stay.
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 Lyon County's estimated $1,202/year on the line.
Lyon County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Lyon County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.