Washington County, OK Insulation Payback
Attic insulation payback for Washington County, OK
Washington 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. Going from R-2 to the recommended R-49 costs roughly $2,820 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2 years at an estimated $1,379/year saved.
Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $1,112/year comes from reduced heating and $267/year from reduced cooling load through the ceiling. Washington County beats 44% of the counties in this 3,171-county dataset on estimated insulation savings. Among the 690 counties DOE places in zone 3, Washington County ranks 9th. Against Oklahoma's own average of $1,260/year, Washington County runs 9% above that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 4,193 HDD and 1,673 CDD (base 65°F, 1991-2020 normals) — come from Bartlesville 3, OK US, the nearest NOAA station with published normals, 7.1 miles from Washington County's center. Combined heating and cooling load puts Washington County in the 49th percentile of this 3,171-county dataset. DOE also classifies Washington County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
If the attic isn't bare
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $186/year saved — roughly 8.7 years to break even. It is close - the payback only just fits a reasonable timeframe.
Next steps for a Washington County attic
Get quotes from at least two local contractors 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 checking upfront given Washington County's estimated $1,379/year on the line.
More on how this was built
Nothing here is a guess: the methodology guide names the DOE climate map and NOAA station data behind every number on this page. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.