Clay County, IN Insulation Payback
Is attic insulation worth it in Clay County, IN?
Clay County sits in IECC climate zone 5 (Cold) — cold enough that heating, not cooling, is what decides the bill. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-60. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-60 runs an estimated $3,480, and saves about $1,529 a year in heating and cooling — a payback around 2.3 years. Few home upgrades pay back that quickly.
Heating vs. cooling in Clay County
Heating accounts for about $1,361/year of that and cooling about $168/year — Clay County needs both. Nationally, Clay County ranks in the 55th percentile for insulation savings potential. Compared only against its own climate zone, Clay County places 714th out of 745. Against Indiana's own average of $1,634/year, Clay County runs 6% below that.
Clay County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 5,089 HDD and 1,045 CDD (base 65°F, 1991-2020 normals) — come from TERRE HAUTE CAA AP, IN US, the nearest NOAA station with published normals, 10.6 miles from Clay County's center. That combined heating-and-cooling load ranks Clay County 1435th nationally by total degree days — the 55th 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
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $223/year saved — roughly 10.2 years to break even. Whether that is worth it depends on how long you plan to stay.
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 Clay County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Clay County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Clay 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.