Caribou County, ID Insulation Payback
Is attic insulation worth it in Caribou County, ID?
Caribou County, Idaho is zone 6 under DOE's climate map (Cold), which means winters that dominate the energy bill, with cooling a minor factor. An uninsulated attic there should be built 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 $2,274 a year — payback in roughly 1.5 years. Few home upgrades pay back that quickly.
Where the savings come from
Heating accounts for about $2,245/year of that and cooling about $29/year — Caribou County needs both. Nationally, Caribou County ranks in the 93th percentile for insulation savings potential. Compared only against its own climate zone, Caribou County places 116th out of 459. Against Idaho's own average of $1,995/year, Caribou County runs 14% above that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 8,396 HDD and 180 CDD (base 65°F, 1991-2020 normals) — come from SODA SPRINGS AP, ID US, the nearest NOAA station with published normals, 9.5 miles from Caribou County's center. By total degree days, Caribou County sits at the 92th percentile nationally. Its moisture regime is classified dry, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
If the attic isn't bare
If Caribou 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 $332/year — payback about 6.9 years. The math clears comfortably within a normal ownership horizon.
Getting it done in Caribou 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 Caribou County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Caribou County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Caribou County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.