Delaware County, OK Insulation Payback
Delaware County attic insulation, by the numbers
Delaware 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. 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 2.2 years at an estimated $1,310/year saved. Topping up the attic pays for itself fast here.
Heating vs. cooling in Delaware County
Split it out and it's roughly $1,077 a year on the heating side, $233 on cooling. By estimated insulation savings, Delaware County lands in the 39th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Delaware County comes in 25th by savings. Oklahoma averages $1,260/year across the counties tracked here; Delaware County comes in 4% higher.
The climate data behind this
The heating and cooling degree days behind this estimate — 4,060 HDD and 1,463 CDD (base 65°F, 1991-2020 normals) — come from UPPER SPAVINAW PORT, OK US, the nearest NOAA station with published normals, 3.3 miles from Delaware County's center. Combined heating and cooling load puts Delaware County in the 40th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Delaware County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $176/year saved — roughly 9.2 years to break even. Call this borderline rather than a clear win.
Getting it done in Delaware County
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $2,820 figure above as a planning number for Delaware County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Delaware County's R-49 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-49 is the target here specifically.