Lee County, IA Insulation Payback
Is attic insulation worth it in Lee County, IA?
Lee 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. 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 $1,755 a year in heating and cooling — a payback around 2 years. Few home upgrades pay back that quickly.
The breakdown behind the number
Heating accounts for about $1,580/year of that and cooling about $175/year — Lee County needs both. Nationally, Lee County ranks in the 70th percentile for insulation savings potential. Compared only against its own climate zone, Lee County places 374th out of 745. Against Iowa's own average of $1,985/year, Lee County runs 12% below that.
The climate data behind this
The heating and cooling degree days behind this estimate — 5,910 HDD and 1,089 CDD (base 65°F, 1991-2020 normals) — come from DONNELLSON, IA US, the nearest NOAA station with published normals, 4.5 miles from Lee County's center. Combined heating and cooling load puts Lee County in the 71th 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.
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 $256/year saved (~8.9-year payback). Whether that is worth it depends on how long you plan to stay.
Quotes and materials for this job
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 Lee County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Lee County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Lee 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.