Lincoln County, WA Insulation Payback
Lincoln County, WA: what topping up your attic actually costs
DOE classifies Lincoln County as climate zone 5, cold — cold enough that heating, not cooling, is what decides the bill. Its recommended attic R-value for bare joists is 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 $1,856 a year in heating and cooling — a payback around 1.9 years. That's about as fast as attic paybacks get.
Heating vs. cooling in Lincoln County
The estimated savings split roughly $1,810/year heating, $47/year cooling. Out of every 100 US counties tracked here, Lincoln County's savings potential beats roughly 76 of them. Within zone 5 specifically, it ranks 197th of 745 counties by estimated savings. Washington averages $1,583/year across the counties tracked here; Lincoln County comes in 17% higher.
Where these numbers come from
Lincoln County's climate figures — 6,768 heating and 290 cooling degree days a year — are read from HARRINGTON, WA US, 10.4 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Lincoln County 871st nationally by total degree days — the 72th percentile. Lincoln 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?
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. This one is a genuine toss-up, not a clear yes.
Next steps for a Lincoln County attic
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 Lincoln 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.