Murray County, MN Insulation Payback
Murray County attic insulation, by the numbers
Murray County sits in IECC climate zone 6 (Cold) — cold enough that heating, not cooling, is what decides the bill. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to 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 $2,335 a year in heating and cooling — a payback around 1.5 years. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $2,256 a year on the heating side, $80 on cooling. By estimated insulation savings, Murray County lands in the 94th percentile nationally. Zone 6 alone covers 459 counties in this dataset, and Murray County comes in 75th by savings. Minnesota averages $2,366/year across the counties tracked here; Murray County comes in 1% lower.
Murray County's actual weather, not a national average
Murray County's climate figures — 8,436 heating and 497 cooling degree days a year — are read from LAKE WILSON, MN US, 9.4 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Murray County 183rd nationally by total degree days — the 94th percentile. One local detail the R-value alone won't tell you: Murray County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
If the attic isn't bare
If Murray County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-49. That smaller top-up costs around $2,280 and saves an estimated $341/year — payback about 6.7 years. Worth doing on the numbers alone.
Next steps for a Murray County attic
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 Murray County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Murray 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.