Redwood County, MN Insulation Payback
Redwood County attic insulation, by the numbers
DOE classifies Redwood 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. 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 1.5 years at an estimated $2,259/year saved. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $2,160 a year on the heating side, $99 on cooling. By estimated insulation savings, Redwood County lands in the 92th percentile nationally. Zone 6 alone covers 459 counties in this dataset, and Redwood County comes in 130th by savings. Minnesota averages $2,366/year across the counties tracked here; Redwood County comes in 5% lower.
Where these numbers come from
The heating and cooling degree days behind this estimate — 8,080 HDD and 616 CDD (base 65°F, 1991-2020 normals) — come from LAMBERTON SW RSCH & OUTREACH C, MN US, the nearest NOAA station with published normals, 11.7 miles from Redwood County's center. Combined heating and cooling load puts Redwood County in the 93th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Redwood County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
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 $330/year saved (~6.9-year payback). Worth doing on the numbers alone.
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 Redwood County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Redwood County's R-60 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-60 is the target here specifically.