Jennings County, IN Insulation Payback
Jennings County attic insulation, by the numbers
Jennings County, Indiana is zone 4 under DOE's climate map (Mixed-Humid), which means heating load in winter and cooling load in summer, both worth taking seriously here. An uninsulated attic there should be built up to R-60. For an attic around 1,000 square feet, closing the gap from R-2 to R-60 costs around $3,480 and saves an estimated $1,453 a year — payback in roughly 2.4 years. Topping up the attic pays for itself fast here.
Heating vs. cooling in Jennings County
Split it out and it's roughly $1,277 a year on the heating side, $176 on cooling. By estimated insulation savings, Jennings County lands in the 50th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Jennings County comes in 271st by savings. Indiana averages $1,634/year across the counties tracked here; Jennings County comes in 11% lower.
Where these numbers come from
NOAA's N VERNON 2 ESE, IN US station, 1.6 miles from Jennings County, supplies the 4,775 HDD and 1,096 CDD this estimate runs on. Combined heating and cooling load puts Jennings County in the 49th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Jennings County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
The smaller top-up scenario
If Jennings 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 $212/year — payback about 10.8 years. Call this borderline rather than a clear win.
Getting it done in Jennings 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 Jennings County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Jennings County's R-60 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-60 is the target here specifically.