Scott County, MN Insulation Payback
Is attic insulation worth it in Scott County, MN?
DOE classifies Scott County as climate zone 6, cold — cold enough that heating, not cooling, is what decides the bill. Its recommended attic R-value for bare joists is R-60. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-60 runs an estimated $3,480, and saves about $2,240 a year in heating and cooling — a payback around 1.6 years. Few home upgrades pay back that quickly.
Heating vs. cooling in Scott County
Heating accounts for about $2,154/year of that and cooling about $85/year — Scott County needs both. Nationally, Scott County ranks in the 91th percentile for insulation savings potential. Compared only against its own climate zone, Scott County places 152nd out of 459. Against Minnesota's own average of $2,366/year, Scott County runs 5% below that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 8,057 HDD and 532 CDD (base 65°F, 1991-2020 normals) — come from JORDAN 1SSW, MN US, the nearest NOAA station with published normals, 5 miles from Scott County's center. That combined heating-and-cooling load ranks Scott County 264th nationally by total degree days — the 92th 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.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $327/year saved — roughly 7 years to break even. The math clears comfortably within a normal ownership horizon.
Getting it done in Scott County
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 Scott County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Scott County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Scott 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.