Pacific County, WA Insulation Payback
Pacific County, WA: what topping up your attic actually costs
Pacific County sits in IECC climate zone 4 (Marine) — mild, damp weather year-round with modest heating load and little cooling. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to 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 $1,497 a year in heating and cooling — a payback around 2.3 years. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $1,490/year heating, $7/year cooling. Out of every 100 US counties tracked here, Pacific County's savings potential beats roughly 53 of them. Within zone 4 specifically, it ranks 179th of 825 counties by estimated savings. Washington averages $1,583/year across the counties tracked here; Pacific County comes in 5% lower.
The climate data behind this
Pacific County's climate figures — 5,572 heating and 44 cooling degree days a year — are read from RAYMOND 2 S, WA US, 7.1 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Pacific County 1819th nationally by total degree days — the 42th percentile. Pacific County falls in DOE's moisture regime C (marine), a detail that affects vapor-barrier recommendations more than the R-value target itself.
If the attic isn't bare
A shallower starting point changes the math: with R-11 already down, only the gap to R-49 needs filling, at roughly $2,280 for an estimated $218/year saved (~10.4-year payback). This one is a genuine toss-up, not a clear yes.
Quotes and materials for this job
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 Pacific 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.