Hendricks County, IN Insulation Payback
Is attic insulation worth it in Hendricks County, IN?
Hendricks County, Indiana is zone 5 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 2 years at an estimated $1,699/year saved. Few home upgrades pay back that quickly.
The breakdown behind the number
Heating accounts for about $1,564/year of that and cooling about $135/year — Hendricks County needs both. Nationally, Hendricks County ranks in the 66th percentile for insulation savings potential. Compared only against its own climate zone, Hendricks County places 488th out of 745. Against Indiana's own average of $1,634/year, Hendricks County runs 4% above that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 5,850 HDD and 840 CDD (base 65°F, 1991-2020 normals) — come from JAMESTOWN 2 E, IN US, the nearest NOAA station with published normals, 11.7 miles from Hendricks County's center. That combined heating-and-cooling load ranks Hendricks County 1088th nationally by total degree days — the 66th percentile. 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.
The smaller top-up scenario
If Hendricks 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 $248/year — payback about 9.2 years. Whether that is worth it depends on how long you plan to stay.
Quotes and materials for this job
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $3,480 as a starting estimate for a Hendricks County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Hendricks County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Hendricks 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.