Dewey County, OK Insulation Payback
Is attic insulation worth it in Dewey County, OK?
Dewey County sits in IECC climate zone 3 (Mixed-Humid) — heating load in winter and cooling load in summer, both worth taking seriously here. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-49. For an attic around 1,000 square feet, closing the gap from R-2 to R-49 costs around $2,820 and saves an estimated $1,422 a year — payback in roughly 2 years. Few home upgrades pay back that quickly.
Heating vs. cooling in Dewey County
Heating accounts for about $1,139/year of that and cooling about $283/year — Dewey County needs both. Nationally, Dewey County ranks in the 47th percentile for insulation savings potential. Compared only against its own climate zone, Dewey County places 3rd out of 690. Against Oklahoma's own average of $1,260/year, Dewey County runs 13% above that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 4,293 HDD and 1,774 CDD (base 65°F, 1991-2020 normals) — come from TALOGA, OK US, the nearest NOAA station with published normals, 5.2 miles from Dewey County's center. By total degree days, Dewey County sits at the 53th percentile nationally. Its moisture regime is classified humid, 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-38 needs filling, at roughly $1,620 for an estimated $191/year saved (~8.5-year payback). Whether that is worth it depends on how long you plan to stay.
Getting it done in Dewey County
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $2,820 as a starting estimate for a Dewey County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Dewey County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Dewey 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.