Marion County, OR Insulation Payback
Marion County attic insulation, by the numbers
Marion County sits in IECC climate zone 4 (Marine) — temperate and damp most of the year, with neither heating nor cooling asking for much. For a currently uninsulated attic, DOE and ENERGY STAR recommend building 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 2.2 years at an estimated $1,618/year saved. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $1,602 a year on the heating side, $16 on cooling. By estimated insulation savings, Marion County lands in the 61th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Marion County comes in 36th by savings. Oregon averages $1,557/year across the counties tracked here; Marion County comes in 4% higher.
The climate data behind this
The heating and cooling degree days behind this estimate — 5,992 HDD and 99 CDD (base 65°F, 1991-2020 normals) — come from SILVER CREEK FALLS, OR US, the nearest NOAA station with published normals, 4 miles from Marion County's center. By total degree days, Marion County sits at the 54th percentile nationally. One local detail the R-value alone won't tell you: Marion County sits in moisture regime C (marine), which can affect the vapor-barrier choice.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $236/year saved — roughly 9.7 years to break even. Call this borderline rather than a clear win.
Getting it done in Marion 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 Marion County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Marion 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.