DeKalb County, IN Insulation Payback
Is attic insulation worth it in DeKalb County, IN?
DOE classifies DeKalb County as climate zone 5, cold — a real winter that drives most of the annual energy bill here. 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 $1,849 a year in heating and cooling — a payback around 1.9 years. Few home upgrades pay back that quickly.
Heating vs. cooling in DeKalb County
Heating accounts for about $1,762/year of that and cooling about $87/year — DeKalb County needs both. Nationally, DeKalb County ranks in the 75th percentile for insulation savings potential. Compared only against its own climate zone, DeKalb County places 207th out of 745. Against Indiana's own average of $1,634/year, DeKalb County runs 13% above that.
The climate data behind this
DeKalb County's climate figures — 6,590 heating and 540 cooling degree days a year — are read from GARRETT 1 S, IN US, 7.4 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, DeKalb County sits at the 74th 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 $270/year saved (~8.5-year payback). Whether that is worth it depends on how long you plan to stay.
Getting it done in DeKalb County
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 DeKalb County, not a bid - contractors typically charge a $600 minimum regardless of job size.
DeKalb County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed DeKalb 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.