Clallam County, WA Insulation Payback
Is attic insulation worth it in Clallam County, WA?
DOE classifies Clallam County as climate zone 4, marine — temperate and damp most of the year, with neither heating nor cooling asking for much. 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 $1,619 a year in heating and cooling — a payback around 2.1 years. Few home upgrades pay back that quickly.
Heating vs. cooling in Clallam County
Heating accounts for about $1,606/year of that and cooling about $13/year — Clallam County needs both. Nationally, Clallam County ranks in the 61th percentile for insulation savings potential. Compared only against its own climate zone, Clallam County places 33rd out of 825. Against Washington's own average of $1,583/year, Clallam County runs 2% above that.
Where these numbers come from
Clallam County's climate figures — 6,008 heating and 81 cooling degree days a year — are read from ELWHA RS, WA US, 15.3 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Clallam County in the 54th percentile of this 3,162-county dataset. Its moisture regime is classified marine, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
Already have some insulation?
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 $236/year saved (~9.7-year payback). Whether that is worth it depends on how long you plan to stay.
Quotes and materials for this job
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $3,480 as a starting estimate for a Clallam County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Clallam County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Clallam 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.