Skagit County, WA Insulation Payback
Skagit County attic insulation, by the numbers
Skagit 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 $1,446 a year in heating and cooling — a payback around 2.4 years. Topping up the attic pays for itself fast here.
Heating vs. cooling in Skagit County
Split it out and it's roughly $1,424 a year on the heating side, $22 on cooling. By estimated insulation savings, Skagit County lands in the 49th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Skagit County comes in 282nd by savings. Washington averages $1,583/year across the counties tracked here; Skagit County comes in 9% lower.
Where these numbers come from
The heating and cooling degree days behind this estimate — 5,325 HDD and 137 CDD (base 65°F, 1991-2020 normals) — come from CONCRETE PPL FISH STN, WA US, the nearest NOAA station with published normals, 4.6 miles from Skagit County's center. That combined heating-and-cooling load ranks Skagit County 1936th nationally by total degree days — the 39th percentile. One local detail the R-value alone won't tell you: Skagit County sits in moisture regime C (marine), which can affect the vapor-barrier choice.
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 $211/year saved (~10.8-year payback). Call this borderline rather than a clear win.
Next steps for a Skagit County attic
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 Skagit County's estimated $1,446/year on the line.
Where these figures come from
Skagit County's R-60 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-60 is the target here specifically.