Alamance County, NC Insulation Payback
Alamance County attic insulation, by the numbers
Alamance County, North Carolina is zone 4 under DOE's climate map (Mixed-Humid), which means heating load in winter and cooling load in summer, both worth taking seriously here. An uninsulated attic there should be built up to R-60. Going from R-2 to the recommended R-60 costs roughly $3,480 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2.9 years at an estimated $1,206/year saved.
Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $950 a year on the heating side, $256 on cooling. By estimated insulation savings, Alamance County lands in the 32nd percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Alamance County comes in 740th by savings. North Carolina averages $1,169/year across the counties tracked here; Alamance County comes in 3% higher.
Where these numbers come from
Alamance County's climate figures — 3,552 heating and 1,593 cooling degree days a year — are read from HAW RVR 1E, NC US, 2.2 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Alamance County 2232nd nationally by total degree days — the 30th percentile. One local detail the R-value alone won't tell you: Alamance 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-49 needs filling, at roughly $2,280 for an estimated $176/year saved (~13-year payback). Call this borderline rather than a clear win.
Quotes and materials for this job
Get quotes from at least two local contractors 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 checking upfront given Alamance County's estimated $1,206/year on the line.
Where these figures come from
Alamance County's R-60 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-60 is the target here specifically.