Marion County, IA Insulation Payback
Attic insulation payback for Marion County, IA
Marion 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. For an attic around 1,000 square feet, closing the gap from R-2 to R-60 costs around $3,480 and saves an estimated $1,868 a year — payback in roughly 1.9 years. Hard to find a home improvement with a faster payback than this.
Heating vs. cooling in Marion County
Of that, about $1,715/year comes from reduced heating and $153/year from reduced cooling load through the ceiling. Marion County beats 76% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 745 counties DOE places in zone 5, Marion County ranks 179th. Against Iowa's own average of $1,985/year, Marion County runs 6% below that.
Where these numbers come from
NOAA's KNOXVILLE, IA US station, 0.6 miles from Marion County, supplies the 6,415 HDD and 950 CDD this estimate runs on. By total degree days, Marion County sits at the 77th percentile nationally. DOE also classifies Marion 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 $272/year saved (~8.4-year payback). It is close - the payback only just fits a reasonable timeframe.
Getting it done in Marion County
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 Marion 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.