Darke County, OH Insulation Payback
Is attic insulation worth it in Darke County, OH?
Darke County, Ohio is zone 5 under DOE's climate map (Cold), which means cold enough that heating, not cooling, is what decides the bill. An uninsulated attic there should be built up to R-60. For an attic around 1,000 square feet, closing the gap from R-2 to R-60 costs around $3,480 and saves an estimated $1,666 a year — payback in roughly 2.1 years. Few home upgrades pay back that quickly.
Where the savings come from
Heating accounts for about $1,517/year of that and cooling about $150/year — Darke County needs both. Nationally, Darke County ranks in the 64th percentile for insulation savings potential. Compared only against its own climate zone, Darke County places 543rd out of 745. Against Ohio's own average of $1,669/year, Darke County runs 0% above that.
The climate data behind this
The heating and cooling degree days behind this estimate — 5,672 HDD and 933 CDD (base 65°F, 1991-2020 normals) — come from GREENVILLE WTP, OH US, the nearest NOAA station with published normals, 2.5 miles from Darke County's center. Combined heating and cooling load puts Darke County in the 64th percentile of this 3,162-county dataset. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
Already have some insulation?
A shallower starting point changes the math: with R-11 already down, only the gap to R-49 needs filling, at roughly $2,280 for an estimated $243/year saved (~9.4-year payback). Whether that is worth it depends on how long you plan to stay.
Next steps for a Darke County attic
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 Darke County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Darke County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Darke County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.