Kittitas County, WA Insulation Payback
Kittitas County, WA: what topping up your attic actually costs
Kittitas County, Washington is zone 5 under DOE's climate map (Cold), which means cold enough that heating, not cooling, is what decides the bill. An uninsulated attic there should be built up to 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 2.1 years at an estimated $1,688/year saved. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $1,596/year heating, $91/year cooling. Out of every 100 US counties tracked here, Kittitas County's savings potential beats roughly 65 of them. Within zone 5 specifically, it ranks 502nd of 745 counties by estimated savings. Washington averages $1,583/year across the counties tracked here; Kittitas County comes in 7% higher.
Kittitas County's actual weather, not a national average
Kittitas County's climate figures — 5,970 heating and 568 cooling degree days a year — are read from ELLENSBURG BOWERS FLD, WA US, 9.3 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Kittitas County sits at the 62th percentile nationally. Kittitas County falls in DOE's moisture regime B (dry), a detail that affects vapor-barrier recommendations more than the R-value target itself.
The smaller top-up scenario
If Kittitas 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 $246/year — payback about 9.3 years. This one is a genuine toss-up, not a clear yes.
Getting it done in Kittitas County
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $3,480 figure above as a planning number for Kittitas County, not a bid - contractors typically charge a $600 minimum regardless of job size.
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.