Des Moines County, IA Insulation Payback
Is attic insulation worth it in Des Moines County, IA?
Des Moines County, Iowa is zone 5 under DOE's climate map (Cold), which means winters that dominate the energy bill, with cooling a minor factor. An uninsulated attic there should be built up to R-60. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-60 runs an estimated $3,480, and saves about $1,743 a year in heating and cooling — a payback around 2 years. Few home upgrades pay back that quickly.
Heating vs. cooling in Des Moines County
Heating accounts for about $1,565/year of that and cooling about $178/year — Des Moines County needs both. Nationally, Des Moines County ranks in the 69th percentile for insulation savings potential. Compared only against its own climate zone, Des Moines County places 403rd out of 745. Against Iowa's own average of $1,985/year, Des Moines County runs 12% below that.
Where these numbers come from
NOAA's GLADSTONE DAM 18, IL US station, 8.8 miles from Des Moines County, supplies the 5,853 HDD and 1,108 CDD this estimate runs on. By total degree days, Des Moines County sits at the 70th percentile nationally. 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.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $254/year saved — roughly 9 years to break even. Whether that is worth it depends on how long you plan to stay.
Getting it done in Des Moines County
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 Des Moines County's estimated $1,743/year on the line.
Des Moines County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Des Moines 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.