Grant County, WI Insulation Payback
Attic insulation payback for Grant County, WI
Grant County sits in IECC climate zone 6 (Cold) — a real winter that drives most of the annual energy bill here. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to 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 $2,065/year saved. Hard to find a home improvement with a faster payback than this.
The breakdown behind the number
Of that, about $1,969/year comes from reduced heating and $96/year from reduced cooling load through the ceiling. Grant 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, Grant County ranks 331st. Against Wisconsin's own average of $2,200/year, Grant County runs 6% below that.
The climate data behind this
Grant County's climate figures — 7,365 heating and 599 cooling degree days a year — are read from LANCASTER 4 WSW, WI US, 5.6 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Grant County sits at the 85th percentile nationally. DOE also classifies Grant 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.
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 Grant 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.