Clinton County, MO Insulation Payback
Clinton County attic insulation, by the numbers
Clinton County, Missouri 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. 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 years at an estimated $1,705/year saved. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $1,517 a year on the heating side, $188 on cooling. By estimated insulation savings, Clinton County lands in the 66th percentile nationally. Zone 5 alone covers 745 counties in this dataset, and Clinton County comes in 482nd by savings. Missouri averages $1,534/year across the counties tracked here; Clinton County comes in 11% higher.
The climate data behind this
Clinton County's climate figures — 5,673 heating and 1,173 cooling degree days a year — are read from CAMERON, MO US, 12.2 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Clinton County sits at the 68th percentile nationally. One local detail the R-value alone won't tell you: Clinton County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
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 $249/year saved (~9.2-year payback). Call this borderline rather than a clear win.
Getting it done in Clinton County
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 Clinton County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Clinton 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.