Marquette County, WI Insulation Payback
Is attic insulation worth it in Marquette County, WI?
Marquette County, Wisconsin is zone 6 under DOE's climate map (Cold), which means cold enough that heating, not cooling, is what decides the bill. 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 $2,111 a year — payback in roughly 1.6 years. Few home upgrades pay back that quickly.
Where the savings come from
Heating accounts for about $2,024/year of that and cooling about $87/year — Marquette County needs both. Nationally, Marquette County ranks in the 87th percentile for insulation savings potential. Compared only against its own climate zone, Marquette County places 284th out of 459. Against Wisconsin's own average of $2,200/year, Marquette County runs 4% below that.
Marquette County's actual weather, not a national average
NOAA's MONTELLO, WI US station, 5.6 miles from Marquette County, supplies the 7,571 HDD and 540 CDD this estimate runs on. That combined heating-and-cooling load ranks Marquette County 407th nationally by total degree days — the 87th percentile. 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.
If the attic isn't bare
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 $308/year saved (~7.4-year payback). The math clears comfortably within a normal ownership horizon.
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 Marquette County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Marquette County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Marquette 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.