Latah County, ID Insulation Payback

Latah County attic insulation, by the numbers

Latah County sits in IECC climate zone 5 (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 $1,855 a year in heating and cooling — a payback around 1.9 years. Topping up the attic pays for itself fast here.

The breakdown behind the number

Split it out and it's roughly $1,819 a year on the heating side, $36 on cooling. By estimated insulation savings, Latah County lands in the 76th percentile nationally. Zone 5 alone covers 745 counties in this dataset, and Latah County comes in 198th by savings. Idaho averages $1,995/year across the counties tracked here; Latah County comes in 7% lower.

Where these numbers come from

Latah County's climate figures — 6,804 heating and 222 cooling degree days a year — are read from POTLATCH 3 NNE, ID US, 11.4 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Latah County sits at the 72th percentile nationally. One local detail the R-value alone won't tell you: Latah County sits in moisture regime B (dry), which can affect the vapor-barrier choice.

Already have some insulation?

Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $271/year saved — roughly 8.4 years to break even. Call this borderline rather than a clear win.

Getting it done in Latah 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 Latah County job, not a quote. Expect at least a $600 minimum charge from most contractors.

Where these figures come from

Latah 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.