Brown County, WI Insulation Payback
Is attic insulation worth it in Brown County, WI?
Brown County, Wisconsin is zone 6 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. 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 $2,088/year saved. Few home upgrades pay back that quickly.
The breakdown behind the number
Heating accounts for about $2,007/year of that and cooling about $82/year — Brown County needs both. Nationally, Brown County ranks in the 86th percentile for insulation savings potential. Compared only against its own climate zone, Brown County places 306th out of 459. Against Wisconsin's own average of $2,200/year, Brown County runs 5% below that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 7,505 HDD and 508 CDD (base 65°F, 1991-2020 normals) — come from GREEN BAY, WI US, the nearest NOAA station with published normals, 5.9 miles from Brown County's center. By total degree days, Brown County sits at the 86th percentile nationally. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
The smaller top-up scenario
If Brown 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 $305/year — payback about 7.5 years. The math clears comfortably within a normal ownership horizon.
Next steps for a Brown 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 Brown County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Brown County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Brown County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.