Clarke County, IA Insulation Payback
Is attic insulation worth it in Clarke County, IA?
Clarke County, Iowa 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 1.9 years at an estimated $1,874/year saved. Few home upgrades pay back that quickly.
Heating vs. cooling in Clarke County
Heating accounts for about $1,722/year of that and cooling about $152/year — Clarke County needs both. Nationally, Clarke County ranks in the 76th percentile for insulation savings potential. Compared only against its own climate zone, Clarke County places 174th out of 745. Against Iowa's own average of $1,985/year, Clarke County runs 6% below that.
Clarke County's actual weather, not a national average
NOAA's OSCEOLA, IA US station, 2 miles from Clarke County, supplies the 6,442 HDD and 945 CDD this estimate runs on. Combined heating and cooling load puts Clarke County in the 78th percentile of this 3,162-county dataset. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $273/year saved — roughly 8.3 years to break even. Whether that is worth it depends on how long you plan to stay.
Next steps for a Clarke County attic
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 Clarke County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Clarke County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Clarke County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.