Wayne County, NC Insulation Payback
Wayne County attic insulation, by the numbers
Wayne County, North Carolina is zone 3 under DOE's climate map (Mixed-Humid), which means a genuine mix of cold winters and humid summers, with neither one dominating the bill. An uninsulated attic there should be built up to R-49. For an attic around 1,000 square feet, closing the gap from R-2 to R-49 costs around $2,820 and saves an estimated $1,037 a year — payback in roughly 2.7 years. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $705 a year on the heating side, $332 on cooling. By estimated insulation savings, Wayne County lands in the 19th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Wayne County comes in 393rd by savings. North Carolina averages $1,169/year across the counties tracked here; Wayne County comes in 11% lower.
The climate data behind this
The heating and cooling degree days behind this estimate — 2,657 HDD and 2,082 CDD (base 65°F, 1991-2020 normals) — come from GOLDSBORO 4 SE, NC US, the nearest NOAA station with published normals, 2.6 miles from Wayne County's center. That combined heating-and-cooling load ranks Wayne County 2589th nationally by total degree days — the 18th percentile. One local detail the R-value alone won't tell you: Wayne County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
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 $140/year saved (~11.6-year payback). Call this borderline rather than a clear win.
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 $2,820 figure above as a planning number for Wayne County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Wayne 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.