Door County, WI Insulation Payback
Attic insulation payback for Door County, WI
Door 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. 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 $2,121 a year — payback in roughly 1.6 years. Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $2,066/year comes from reduced heating and $56/year from reduced cooling load through the ceiling. Door County beats 87% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 459 counties DOE places in zone 6, Door County ranks 277th. Against Wisconsin's own average of $2,200/year, Door County runs 4% below that.
Door County's actual weather, not a national average
NOAA's EPHRAIM 1NE-WWTP, WI US station, 7.4 miles from Door County, supplies the 7,725 HDD and 347 CDD this estimate runs on. Combined heating and cooling load puts Door County in the 87th percentile of this 3,162-county dataset. DOE also classifies Door 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 $309/year saved (~7.4-year payback). Topping up the attic pays for itself here.
Next steps for a Door 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 Door 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.