Currituck County, NC Insulation Payback
Currituck County attic insulation, by the numbers
Currituck County, North Carolina is zone 3 under DOE's climate map (Mixed-Humid), which means real heating and real cooling seasons both, roughly balanced across the year. An uninsulated attic there should be built up to R-49. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-49 runs an estimated $2,820, and saves about $1,090 a year in heating and cooling — a payback around 2.6 years. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $810 a year on the heating side, $280 on cooling. By estimated insulation savings, Currituck County lands in the 24th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Currituck County comes in 256th by savings. North Carolina averages $1,169/year across the counties tracked here; Currituck County comes in 7% lower.
The climate data behind this
The heating and cooling degree days behind this estimate — 3,053 HDD and 1,759 CDD (base 65°F, 1991-2020 normals) — come from ELIZABETH CITY CGAS, NC US, the nearest NOAA station with published normals, 15.1 miles from Currituck County's center. By total degree days, Currituck County sits at the 20th percentile nationally. One local detail the R-value alone won't tell you: Currituck County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
Already have some insulation?
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 $147/year saved (~11-year payback). Call this borderline rather than a clear win.
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 Currituck County's estimated $1,090/year on the line.
Where these figures come from
Currituck 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.