Clinton County, IA Insulation Payback
Clinton County, IA: what topping up your attic actually costs
Clinton County sits in IECC climate zone 5 (Cold) — a real winter that drives most of the annual energy bill here. 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 $1,975 a year — payback in roughly 1.8 years.
That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $1,856/year heating, $118/year cooling. Out of every 100 US counties tracked here, Clinton County's savings potential beats roughly 81 of them. Within zone 5 specifically, it ranks 66th of 754 counties by estimated savings. Iowa averages $1,985/year across the counties tracked here; Clinton County comes in 1% lower.
The climate data behind this
Clinton County's climate figures — 6,943 heating and 737 cooling degree days a year — are read from Maquoketa, IA US, 14.1 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Clinton County 576th nationally by total degree days — the 82nd 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.
If the attic isn't bare
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 $288/year saved (~7.9-year payback). That is a solid payback as home upgrades go.
Getting it done in Clinton County
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first, so treat the $3,480 figure above as a planning number for Clinton County, not a bid. Worth getting quotes from at least two local contractors before committing - most charge a $600 minimum regardless of job size.
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.