Jay County, IN Insulation Payback
Jay County, IN: what topping up your attic actually costs
Jay 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 $1,752 a year in heating and cooling — a payback around 2 years. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $1,628/year heating, $124/year cooling. Out of every 100 US counties tracked here, Jay County's savings potential beats roughly 69 of them. Within zone 5 specifically, it ranks 384th of 745 counties by estimated savings. Indiana averages $1,634/year across the counties tracked here; Jay County comes in 7% higher.
The climate data behind this
The heating and cooling degree days behind this estimate — 6,090 HDD and 771 CDD (base 65°F, 1991-2020 normals) — come from PORTLAND 1 SW, IN US, the nearest NOAA station with published normals, 1.3 miles from Jay County's center. Combined heating and cooling load puts Jay County in the 68th percentile of this 3,162-county dataset. Jay County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
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 $256/year saved (~8.9-year payback). This one is a genuine toss-up, not a clear yes.
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 Jay County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-60 is the target here specifically.