Houston County, MN Insulation Payback
Houston County attic insulation, by the numbers
DOE classifies Houston County as climate zone 6, cold — a real winter that drives most of the annual energy bill here. 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 1.6 years at an estimated $2,137/year saved. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $2,043 a year on the heating side, $94 on cooling. By estimated insulation savings, Houston County lands in the 88th percentile nationally. Zone 6 alone covers 459 counties in this dataset, and Houston County comes in 249th by savings. Minnesota averages $2,366/year across the counties tracked here; Houston County comes in 10% lower.
The climate data behind this
The heating and cooling degree days behind this estimate — 7,641 HDD and 587 CDD (base 65°F, 1991-2020 normals) — come from CALEDONIA, MN US, the nearest NOAA station with published normals, 2.5 miles from Houston County's center. Combined heating and cooling load puts Houston County in the 88th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Houston 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 $312/year saved (~7.3-year payback). Worth doing on the numbers alone.
Getting it done in Houston County
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 Houston County's estimated $2,137/year on the line.
Where these figures come from
Houston 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.