Jackson County, OR Insulation Payback
Is attic insulation worth it in Jackson County, OR?
Jackson 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. 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 2.7 years at an estimated $1,270/year saved. Few home upgrades pay back that quickly.
The breakdown behind the number
Heating accounts for about $1,124/year of that and cooling about $146/year — Jackson County needs both. Nationally, Jackson County ranks in the 36th percentile for insulation savings potential. Compared only against its own climate zone, Jackson County places 641st out of 825. Against Oregon's own average of $1,557/year, Jackson County runs 18% below that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 4,203 HDD and 908 CDD (base 65°F, 1991-2020 normals) — come from MEDFORD ROGUE VLY AP, OR US, the nearest NOAA station with published normals, 10.3 miles from Jackson County's center. That combined heating-and-cooling load ranks Jackson County 2251st nationally by total degree days — the 29th percentile. 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.
The smaller top-up scenario
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 $185/year saved (~12.3-year payback). Whether that is worth it depends on how long you plan to stay.
Next steps for a Jackson 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 Jackson County's estimated $1,270/year on the line.
Jackson County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Jackson 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.