Columbia County, WI Insulation Payback
Attic insulation payback for Columbia County, WI
DOE classifies Columbia 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. Going from R-2 to the recommended R-60 costs roughly $3,480 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 1.7 years at an estimated $2,063/year saved. Hard to find a home improvement with a faster payback than this.
The breakdown behind the number
Of that, about $1,963/year comes from reduced heating and $100/year from reduced cooling load through the ceiling. Columbia County beats 85% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 459 counties DOE places in zone 6, Columbia County ranks 334th. Against Wisconsin's own average of $2,200/year, Columbia County runs 6% below that.
Where these numbers come from
Columbia County's climate figures — 7,342 heating and 622 cooling degree days a year — are read from PORTAGE WWTP, WI US, 6.7 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Columbia County 469th nationally by total degree days — the 85th percentile. DOE also classifies Columbia County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
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 $301/year saved (~7.6-year payback). Topping up the attic pays for itself here.
Next steps for a Columbia County attic
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 Columbia 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.