Fayette County, IA Insulation Payback
Is attic insulation worth it in Fayette County, IA?
DOE classifies Fayette County as climate zone 6, cold — a real winter that drives most of the annual energy bill here. Its recommended attic R-value for bare joists is 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 $2,161 a year in heating and cooling — a payback around 1.6 years. Few home upgrades pay back that quickly.
Heating vs. cooling in Fayette County
Heating accounts for about $2,077/year of that and cooling about $84/year — Fayette County needs both. Nationally, Fayette County ranks in the 89th percentile for insulation savings potential. Compared only against its own climate zone, Fayette County places 230th out of 459. Against Iowa's own average of $1,985/year, Fayette County runs 9% above that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 7,767 HDD and 523 CDD (base 65°F, 1991-2020 normals) — come from FAYETTE, IA US, the nearest NOAA station with published normals, 1.4 miles from Fayette County's center. That combined heating-and-cooling load ranks Fayette County 353rd nationally by total degree days — the 89th percentile. 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.
If the attic isn't bare
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $315/year saved — roughly 7.2 years to break even. The math clears comfortably within a normal ownership horizon.
Next steps for a Fayette County attic
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 Fayette County's estimated $2,161/year on the line.
Fayette County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Fayette 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.