Clearwater County, ID Insulation Payback
Clearwater County, ID: what topping up your attic actually costs
DOE classifies Clearwater County as climate zone 5, 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 $2,216/year saved. That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $2,204/year heating, $12/year cooling. Out of every 100 US counties tracked here, Clearwater County's savings potential beats roughly 91 of them. Within zone 5 specifically, it ranks 6th of 745 counties by estimated savings. Idaho averages $1,995/year across the counties tracked here; Clearwater County comes in 11% higher.
The climate data behind this
Clearwater County's climate figures — 8,243 heating and 73 cooling degree days a year — are read from HEADQUARTERS, ID US, 7.9 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Clearwater County in the 89th percentile of this 3,162-county dataset. Clearwater County falls in DOE's moisture regime B (dry), a detail that affects vapor-barrier recommendations more than the R-value target itself.
Already have some insulation?
If Clearwater County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-49. That smaller top-up costs around $2,280 and saves an estimated $323/year — payback about 7.1 years. That is a solid payback as home upgrades go.
Next steps for a Clearwater 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 Clearwater County's estimated $2,216/year on the line.
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.