Simpson County, KY Insulation Payback
Simpson County, KY: what topping up your attic actually costs
Simpson 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. 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 2.6 years at an estimated $1,313/year saved. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $1,065/year heating, $248/year cooling. Out of every 100 US counties tracked here, Simpson County's savings potential beats roughly 39 of them. Within zone 4 specifically, it ranks 557th of 825 counties by estimated savings. Kentucky averages $1,385/year across the counties tracked here; Simpson County comes in 5% lower.
Simpson County's actual weather, not a national average
Simpson County's climate figures — 3,984 heating and 1,545 cooling degree days a year — are read from PORTLAND SEWAGE PLT, TN US, 11 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Simpson County sits at the 40th percentile nationally. Simpson 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?
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $192/year saved — roughly 11.9 years to break even. This one is a genuine toss-up, not a clear yes.
Quotes and materials for this job
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $3,480 as a starting estimate for a Simpson County job, not a quote. Expect at least a $600 minimum charge from most contractors.
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.