Delaware County, IA Insulation Payback
Delaware County attic insulation, by the numbers
Delaware County, Iowa is zone 6 under DOE's climate map (Cold), which means winters that dominate the energy bill, with cooling a minor factor. An uninsulated attic there should be built 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 1.7 years at an estimated $2,076/year saved. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $1,976 a year on the heating side, $99 on cooling. By estimated insulation savings, Delaware County lands in the 85th percentile nationally. Zone 6 alone covers 459 counties in this dataset, and Delaware County comes in 319th by savings. Iowa averages $1,985/year across the counties tracked here; Delaware County comes in 5% higher.
The climate data behind this
NOAA's MANCHESTER #2, IA US station, 4.3 miles from Delaware County, supplies the 7,392 HDD and 617 CDD this estimate runs on. Combined heating and cooling load puts Delaware County in the 86th 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.
The smaller top-up scenario
If Delaware 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 $303/year — payback about 7.5 years. Worth doing on the numbers alone.
Quotes and materials for this job
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $3,480 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-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.