Grant County, AR Insulation Payback
Grant County attic insulation, by the numbers
Grant County sits in IECC climate zone 3 (Mixed-Humid) — real heating and real cooling seasons both, roughly balanced across the year. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-49. Going from R-2 to the recommended R-49 costs roughly $2,820 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2.4 years at an estimated $1,170/year saved. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $864 a year on the heating side, $306 on cooling. By estimated insulation savings, Grant County lands in the 29th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Grant County comes in 129th by savings. Arkansas averages $1,185/year across the counties tracked here; Grant County comes in 1% lower.
The climate data behind this
The heating and cooling degree days behind this estimate — 3,255 HDD and 1,920 CDD (base 65°F, 1991-2020 normals) — come from SHERIDAN, AR US, the nearest NOAA station with published normals, 2.1 miles from Grant County's center. Combined heating and cooling load puts Grant County in the 30th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Grant County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
The smaller top-up scenario
If Grant County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-38. That smaller top-up costs around $1,620 and saves an estimated $158/year — payback about 10.3 years. Call this borderline rather than a clear win.
Getting it done in Grant County
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $2,820 figure above as a planning number for Grant County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Grant County's R-49 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-49 is the target here specifically.