Benton County, AR Insulation Payback
Benton County, AR: what topping up your attic actually costs
Benton County, Arkansas 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. 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 $1,344 a year in heating and cooling — a payback around 2.6 years. That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $1,119/year heating, $225/year cooling. Out of every 100 US counties tracked here, Benton County's savings potential beats roughly 42 of them. Within zone 4 specifically, it ranks 499th of 825 counties by estimated savings. Arkansas averages $1,185/year across the counties tracked here; Benton County comes in 13% higher.
Where these numbers come from
NOAA's BENTONVILLE 4 S, AR US station, 2.5 miles from Benton County, supplies the 4,186 HDD and 1,398 CDD this estimate runs on. That combined heating-and-cooling load ranks Benton County 1843rd nationally by total degree days — the 42th percentile. 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 $196/year saved — roughly 11.6 years to break even. This one is a genuine toss-up, not a clear yes.
Quotes and materials for this job
Get more than one quote before committing. Attic access and any needed air sealing move the price around, and most contractors won't take a job below roughly $600 regardless of size - worth asking upfront given Benton County's estimated $1,344/year on the line.
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.