Union County, IN Insulation Payback
Is attic insulation worth it in Union County, IN?
DOE classifies Union County as climate zone 5, cold — winters that dominate the energy bill, with cooling a minor factor. Its recommended attic R-value for bare joists is 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 $1,578 a year in heating and cooling — a payback around 2.2 years. Few home upgrades pay back that quickly.
The breakdown behind the number
Heating accounts for about $1,402/year of that and cooling about $175/year — Union County needs both. Nationally, Union County ranks in the 58th percentile for insulation savings potential. Compared only against its own climate zone, Union County places 667th out of 745. Against Indiana's own average of $1,634/year, Union County runs 3% below that.
The climate data behind this
NOAA's BROOKVILLE, IN US station, 14.6 miles from Union County, supplies the 5,245 HDD and 1,092 CDD this estimate runs on. By total degree days, Union County sits at the 59th percentile nationally. 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
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 $230/year saved (~9.9-year payback). 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 Union County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Union County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Union 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.