Stephens County, OK Insulation Payback
Attic insulation payback for Stephens County, OK
Stephens County sits in IECC climate zone 3 (Mixed-Humid) — a genuine mix of cold winters and humid summers, with neither one dominating the bill. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-49. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-49 runs an estimated $2,820, and saves about $1,183 a year in heating and cooling — a payback around 2.4 years. Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $850/year comes from reduced heating and $333/year from reduced cooling load through the ceiling. Stephens County beats 30% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 690 counties DOE places in zone 3, Stephens County ranks 117th. Against Oklahoma's own average of $1,260/year, Stephens County runs 6% below that.
The climate data behind this
Stephens County's climate figures — 3,203 heating and 2,091 cooling degree days a year — are read from DUNCAN, OK US, 6.1 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Stephens County in the 34th percentile of this 3,162-county dataset. DOE also classifies Stephens 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
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 $159/year saved (~10.2-year payback). It is close - the payback only just fits a reasonable timeframe.
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 $2,820 as a starting estimate for a Stephens County job, not a quote. Expect at least a $600 minimum charge from most contractors.
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.