Pender County, NC Insulation Payback
Pender County, NC: what topping up your attic actually costs
Pender County sits in IECC climate zone 3 (Hot-Humid) — humid heat for much of the year, with cooling running far more than heating ever does. For a currently uninsulated attic, DOE and ENERGY STAR recommend building 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 $1,039 a year in heating and cooling — a payback around 2.7 years. That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $730/year heating, $308/year cooling. Out of every 100 US counties tracked here, Pender County's savings potential beats roughly 19 of them. Within zone 3 specifically, it ranks 389th of 690 counties by estimated savings. North Carolina averages $1,169/year across the counties tracked here; Pender County comes in 11% lower.
The climate data behind this
Pender County's climate figures — 2,752 heating and 1,935 cooling degree days a year — are read from MOORES CREEK NB, NC US, 13.2 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Pender County sits at the 16th percentile nationally. Pender County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
Already have some insulation?
If Pender 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 $140/year — payback about 11.6 years. This one is a genuine toss-up, not a clear yes.
Getting it done in Pender 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 Pender County's estimated $1,039/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-49 is the target here specifically.