Clinton County, MI Insulation Payback
Clinton County, MI: what topping up your attic actually costs
Clinton County, Michigan is zone 5 under DOE's climate map (Cold), which means a real winter that drives most of the annual energy bill here. 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 $1,860 a year — payback in roughly 1.9 years. That's about as fast as attic paybacks get.
Heating vs. cooling in Clinton County
The estimated savings split roughly $1,740/year heating, $120/year cooling. Out of every 100 US counties tracked here, Clinton County's savings potential beats roughly 76 of them. Within zone 5 specifically, it ranks 190th of 745 counties by estimated savings. Michigan averages $2,064/year across the counties tracked here; Clinton County comes in 10% lower.
Where these numbers come from
Clinton County's climate figures — 6,508 heating and 745 cooling degree days a year — are read from SAINT JOHNS, MI US, 4.6 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Clinton County 764th nationally by total degree days — the 76th percentile. Clinton 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
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 $271/year saved (~8.4-year payback). This one is a genuine toss-up, not a clear yes.
Next steps for a Clinton County attic
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 Clinton County's estimated $1,860/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.