Douglas County, KS Insulation Payback
Douglas County attic insulation, by the numbers
Douglas County sits in IECC climate zone 4 (Mixed-Humid) — real heating and real cooling seasons both, roughly balanced across the year. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-60. Going from R-2 to the recommended R-60 costs roughly $3,480 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2.2 years at an estimated $1,602/year saved. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $1,394 a year on the heating side, $209 on cooling. By estimated insulation savings, Douglas County lands in the 60th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Douglas County comes in 48th by savings. Kansas averages $1,594/year across the counties tracked here; Douglas County comes in 1% higher.
The climate data behind this
NOAA's CLINTON LAKE, KS US station, 4 miles from Douglas County, supplies the 5,212 HDD and 1,300 CDD this estimate runs on. That combined heating-and-cooling load ranks Douglas County 1206th nationally by total degree days — the 62th percentile. One local detail the R-value alone won't tell you: Douglas County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
Already have some insulation?
If Douglas County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-49. That smaller top-up costs around $2,280 and saves an estimated $234/year — payback about 9.8 years. Call this borderline rather than a clear win.
Next steps for a Douglas County attic
Get more than one quote 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 asking upfront given Douglas County's estimated $1,602/year on the line.
Where these figures come from
Douglas County's R-60 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-60 is the target here specifically.