Lenawee County, MI Insulation Payback
Lenawee County, MI: what topping up your attic actually costs
Lenawee County sits in IECC climate zone 5 (Cold) — cold enough that heating, not cooling, is what decides the bill. 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 $1,818 a year — payback in roughly 1.9 years. That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $1,707/year heating, $111/year cooling. Out of every 100 US counties tracked here, Lenawee County's savings potential beats roughly 73 of them. Within zone 5 specifically, it ranks 266th of 745 counties by estimated savings. Michigan averages $2,064/year across the counties tracked here; Lenawee County comes in 12% lower.
Lenawee County's actual weather, not a national average
Lenawee County's climate figures — 6,383 heating and 694 cooling degree days a year — are read from ADRIAN LENAWEE CO AP, MI US, 2 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Lenawee County sits at the 73th percentile nationally. Lenawee County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
The smaller top-up scenario
If Lenawee 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 $265/year — payback about 8.6 years. This one is a genuine toss-up, not a clear yes.
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 Lenawee County's estimated $1,818/year on the line.
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.