Stanley County, SD Insulation Payback
Stanley County attic insulation, by the numbers
Stanley County sits in IECC climate zone 6 (Cold) — a real winter that drives most of the annual energy bill here. 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 $2,062 a year in heating and cooling — a payback around 1.7 years. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $1,918 a year on the heating side, $144 on cooling. By estimated insulation savings, Stanley County lands in the 85th percentile nationally. Zone 6 alone covers 459 counties in this dataset, and Stanley County comes in 335th by savings. South Dakota averages $2,162/year across the counties tracked here; Stanley County comes in 5% lower.
The climate data behind this
Stanley County's climate figures — 7,173 heating and 894 cooling degree days a year — are read from FT PIERRE 17 WSW, SD US, 12.5 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Stanley County in the 87th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Stanley County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
If the attic isn't bare
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $301/year saved — roughly 7.6 years to break even. Worth doing on the numbers alone.
Next steps for a Stanley County attic
Get more than one quote before committing. Attic access and any needed air sealing move the price around, and most contractors won't take a job below roughly $600 regardless of size - worth asking upfront given Stanley County's estimated $2,062/year on the line.
Where these figures come from
Stanley 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.