Washita County, OK Insulation Payback
Washita County, OK: what topping up your attic actually costs
DOE classifies Washita County as climate zone 3, mixed-humid — heating load in winter and cooling load in summer, both worth taking seriously here. Its recommended attic R-value for bare joists is 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 $1,294 a year in heating and cooling — a payback around 2.2 years. That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $966/year heating, $328/year cooling. Out of every 100 US counties tracked here, Washita County's savings potential beats roughly 38 of them. Within zone 3 specifically, it ranks 30th of 690 counties by estimated savings. Oklahoma averages $1,260/year across the counties tracked here; Washita County comes in 3% higher.
The climate data behind this
Washita County's climate figures — 3,640 heating and 2,059 cooling degree days a year — are read from BESSIE 4WNW MESONET, OK US, 8.6 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Washita County sits at the 45th percentile nationally. Washita County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
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 $174/year saved (~9.3-year payback). This one is a genuine toss-up, not a clear yes.
Getting it done in Washita 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 Washita County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-49 is the target here specifically.