Worth County, IA Insulation Payback
Attic insulation payback for Worth County, IA
DOE classifies Worth 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. 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 $2,303 a year — payback in roughly 1.5 years. Hard to find a home improvement with a faster payback than this.
The breakdown behind the number
Of that, about $2,240/year comes from reduced heating and $63/year from reduced cooling load through the ceiling. Worth County beats 93% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 459 counties DOE places in zone 6, Worth County ranks 94th. Against Iowa's own average of $1,985/year, Worth County runs 16% above that.
The climate data behind this
NOAA's NORTHWOOD, IA US station, 4.6 miles from Worth County, supplies the 8,378 HDD and 392 CDD this estimate runs on. By total degree days, Worth County sits at the 93th percentile nationally. DOE also classifies Worth County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
Already have some insulation?
If Worth County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-49. That smaller top-up costs around $2,280 and saves an estimated $336/year — payback about 6.8 years. Topping up the attic pays for itself here.
Next steps for a Worth County attic
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 Worth County job, not a quote. Expect at least a $600 minimum charge from most contractors.
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.