Moore County, NC Insulation Payback
Moore County, NC: what topping up your attic actually costs
DOE classifies Moore County as climate zone 3, mixed-humid — heating load in winter and cooling load in summer, both worth taking seriously here. Its recommended attic R-value for bare joists is 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 $1,103 a year — payback in roughly 2.6 years. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $842/year heating, $262/year cooling. Out of every 100 US counties tracked here, Moore County's savings potential beats roughly 25 of them. Within zone 3 specifically, it ranks 232nd of 690 counties by estimated savings. North Carolina averages $1,169/year across the counties tracked here; Moore County comes in 6% lower.
The climate data behind this
Moore County's climate figures — 3,172 heating and 1,641 cooling degree days a year — are read from CARTHAGE WTP, NC US, 5.1 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Moore County in the 20th percentile of this 3,162-county dataset. Moore County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
If the attic isn't bare
If Moore 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 $149/year — payback about 10.9 years. This one is a genuine toss-up, not a clear yes.
Getting it done in Moore 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 Moore County's estimated $1,103/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.