Lyon County, IA Insulation Payback
Attic insulation payback for Lyon County, IA
DOE classifies Lyon County as climate zone 6, cold — winters that dominate the energy bill, with cooling a minor factor. 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 $2,160 a year in heating and cooling — a payback around 1.6 years. Hard to find a home improvement with a faster payback than this.
The breakdown behind the number
Of that, about $2,039/year comes from reduced heating and $121/year from reduced cooling load through the ceiling. Lyon County beats 89% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 459 counties DOE places in zone 6, Lyon County ranks 231st. Against Iowa's own average of $1,985/year, Lyon County runs 9% above that.
The climate data behind this
Lyon County's climate figures — 7,625 heating and 753 cooling degree days a year — are read from ROCK RAPIDS, IA US, 3.7 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Lyon County in the 90th percentile of this 3,162-county dataset. DOE also classifies Lyon County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
Already have some insulation?
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 $315/year saved (~7.2-year payback). Topping up the attic pays for itself here.
Quotes and materials for this job
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $3,480 figure above as a planning number for Lyon County, not a bid - contractors typically charge a $600 minimum regardless of job size.
More on how this was built
Nothing here is a guess: the methodology guide names the DOE climate map and NOAA station data behind every number on this page. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.