Butte County, ID Insulation Payback
Butte County attic insulation, by the numbers
Butte County sits in IECC climate zone 6 (Cold) — winters that dominate the energy bill, with cooling a minor factor. 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 $2,204 a year — payback in roughly 1.6 years. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $2,153 a year on the heating side, $50 on cooling. By estimated insulation savings, Butte County lands in the 90th percentile nationally. Zone 6 alone covers 459 counties in this dataset, and Butte County comes in 181st by savings. Idaho averages $1,995/year across the counties tracked here; Butte County comes in 10% higher.
Where these numbers come from
The heating and cooling degree days behind this estimate — 8,053 HDD and 313 CDD (base 65°F, 1991-2020 normals) — come from ARCO, ID US, the nearest NOAA station with published normals, 7 miles from Butte County's center. That combined heating-and-cooling load ranks Butte County 333rd nationally by total degree days — the 89th percentile. One local detail the R-value alone won't tell you: Butte County sits in moisture regime B (dry), 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 $321/year saved (~7.1-year payback). Worth doing on the numbers alone.
Next steps for a Butte County attic
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 Butte County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Butte 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.