Clark County, AR Insulation Payback
Attic insulation payback for Clark County, AR
DOE classifies Clark County as climate zone 3, mixed-humid — a genuine mix of cold winters and humid summers, with neither one dominating the bill. Its recommended attic R-value for bare joists is 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 2.6 years at an estimated $1,097/year saved. Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $747/year comes from reduced heating and $350/year from reduced cooling load through the ceiling. Clark County beats 24% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 690 counties DOE places in zone 3, Clark County ranks 242nd. Against Arkansas's own average of $1,185/year, Clark County runs 7% below that.
Clark County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 2,814 HDD and 2,196 CDD (base 65°F, 1991-2020 normals) — come from ARKADELPHIA 2 N, AR US, the nearest NOAA station with published normals, 9.1 miles from Clark County's center. That combined heating-and-cooling load ranks Clark County 2334th nationally by total degree days — the 26th percentile. DOE also classifies Clark County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
If the attic isn't bare
A shallower starting point changes the math: with R-11 already down, only the gap to R-38 needs filling, at roughly $1,620 for an estimated $148/year saved (~11-year payback). It is close - the payback only just fits a reasonable timeframe.
Getting it done in Clark County
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 Clark County's estimated $1,097/year on the line.
More on how this was built
Nothing here is a guess: the methodology guide names the DOE climate map and NOAA station data behind every number on this page. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.