Grant County, MN Insulation Payback
Grant County attic insulation, by the numbers
DOE classifies Grant County as climate zone 7, very cold — a climate where the heating season stretches across most of the year. 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 1.4 years at an estimated $2,421/year saved. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $2,341 a year on the heating side, $80 on cooling. By estimated insulation savings, Grant County lands in the 96th percentile nationally. Zone 7 alone covers 120 counties in this dataset, and Grant County comes in 85th by savings. Minnesota averages $2,366/year across the counties tracked here; Grant County comes in 2% higher.
The climate data behind this
Grant County's climate figures — 8,757 heating and 498 cooling degree days a year — are read from MORRIS W CNTRL RSCH & OUTREACH, MN US, 24.4 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Grant County in the 96th percentile of this 3,162-county dataset.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $353/year saved — roughly 6.5 years to break even. Worth doing on the numbers alone.
Quotes and materials for this job
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 Grant County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Grant 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.