Miami County, IN Insulation Payback
Is attic insulation worth it in Miami County, IN?
Miami 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 $1,712 a year in heating and cooling — a payback around 2 years. Few home upgrades pay back that quickly.
Heating vs. cooling in Miami County
Heating accounts for about $1,562/year of that and cooling about $151/year — Miami County needs both. Nationally, Miami County ranks in the 67th percentile for insulation savings potential. Compared only against its own climate zone, Miami County places 463rd out of 745. Against Indiana's own average of $1,634/year, Miami County runs 5% above that.
The climate data behind this
The heating and cooling degree days behind this estimate — 5,841 HDD and 938 CDD (base 65°F, 1991-2020 normals) — come from WABASH, IN US, the nearest NOAA station with published normals, 11.5 miles from Miami County's center. That combined heating-and-cooling load ranks Miami County 1036th nationally by total degree days — the 67th 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.
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 $250/year saved (~9.1-year payback). Whether that is worth it depends on how long you plan to stay.
Quotes and materials for this job
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 Miami County's estimated $1,712/year on the line.
Miami County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Miami 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.