Franklin County, KY Insulation Payback
Franklin County attic insulation, by the numbers
Franklin County sits in IECC climate zone 4 (Mixed-Humid) — real heating and real cooling seasons both, roughly balanced across the year. For a currently uninsulated attic, DOE and ENERGY STAR recommend building 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 $1,387 a year — payback in roughly 2.5 years. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $1,173 a year on the heating side, $214 on cooling. By estimated insulation savings, Franklin County lands in the 45th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Franklin County comes in 411th by savings. Kentucky averages $1,385/year across the counties tracked here; Franklin County comes in 0% higher.
Franklin County's actual weather, not a national average
Franklin County's climate figures — 4,386 heating and 1,332 cooling degree days a year — are read from FRANKFORT CAPITAL CITY AP, KY US, 3.9 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Franklin County in the 45th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Franklin County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
The smaller top-up scenario
If Franklin 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 $202/year — payback about 11.3 years. Call this borderline rather than a clear win.
Next steps for a Franklin County attic
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 Franklin County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Franklin 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.