Stevens County, WA Insulation Payback
Is attic insulation worth it in Stevens County, WA?
DOE classifies Stevens County as climate zone 6, cold — winters that dominate the energy bill, with cooling a minor factor. Its recommended attic R-value for bare joists is 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 $1,931 a year — payback in roughly 1.8 years. Few home upgrades pay back that quickly.
Heating vs. cooling in Stevens County
Heating accounts for about $1,889/year of that and cooling about $42/year — Stevens County needs both. Nationally, Stevens County ranks in the 79th percentile for insulation savings potential. Compared only against its own climate zone, Stevens County places 436th out of 459. Against Washington's own average of $1,583/year, Stevens County runs 22% above that.
The climate data behind this
The heating and cooling degree days behind this estimate — 7,065 HDD and 261 CDD (base 65°F, 1991-2020 normals) — come from CHEWELAH, WA US, the nearest NOAA station with published normals, 9.5 miles from Stevens County's center. By total degree days, Stevens County sits at the 77th 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.
The smaller top-up scenario
If Stevens 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 $282/year — payback about 8.1 years. Whether that is worth it depends on how long you plan to stay.
Quotes and materials for this job
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 Stevens County's estimated $1,931/year on the line.
Stevens County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Stevens 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.