Benton County, IN Insulation Payback
Benton County, IN: what topping up your attic actually costs
Benton County, Indiana is zone 5 under DOE's climate map (Cold), which means winters that dominate the energy bill, with cooling a minor factor. An uninsulated attic there should be built 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 $1,804 a year in heating and cooling — a payback around 1.9 years. That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $1,680/year heating, $123/year cooling. Out of every 100 US counties tracked here, Benton County's savings potential beats roughly 73 of them. Within zone 5 specifically, it ranks 285th of 745 counties by estimated savings. Indiana averages $1,634/year across the counties tracked here; Benton County comes in 10% higher.
Where these numbers come from
The heating and cooling degree days behind this estimate — 6,285 HDD and 768 CDD (base 65°F, 1991-2020 normals) — come from BOSWELL 4WNW, IN US, the nearest NOAA station with published normals, 8.6 miles from Benton County's center. By total degree days, Benton County sits at the 72th percentile nationally. Benton 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
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $263/year saved — roughly 8.7 years to break even. 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 Benton 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.