Keweenaw County, MI Insulation Payback
Keweenaw County, MI: what topping up your attic actually costs
Keweenaw County sits in IECC climate zone 7 (Very Cold) — a climate where the heating season stretches across most of the year. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-60. For an attic around 1,000 square feet, closing the gap from R-2 to R-60 costs around $3,480 and saves an estimated $2,443 a year — payback in roughly 1.4 years. That's about as fast as attic paybacks get.
Heating vs. cooling in Keweenaw County
The estimated savings split roughly $2,410/year heating, $33/year cooling. Out of every 100 US counties tracked here, Keweenaw County's savings potential beats roughly 96 of them. Within zone 7 specifically, it ranks 81st of 120 counties by estimated savings. Michigan averages $2,064/year across the counties tracked here; Keweenaw County comes in 18% higher.
The climate data behind this
The heating and cooling degree days behind this estimate — 9,013 HDD and 206 CDD (base 65°F, 1991-2020 normals) — come from HANCOCK HOUGHTON CO AP, MI US, the nearest NOAA station with published normals, 15.2 miles from Keweenaw County's center. By total degree days, Keweenaw County sits at the 96th percentile nationally.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $356/year saved — roughly 6.4 years to break even. That is a solid payback as home upgrades go.
Getting it done in Keweenaw County
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 Keweenaw County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-60 is the target here specifically.