Swain County, NC Insulation Payback
Swain County attic insulation, by the numbers
DOE classifies Swain County as climate zone 4, 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-60. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-60 runs an estimated $3,480, and saves about $1,633 a year in heating and cooling — a payback around 2.1 years. Topping up the attic pays for itself fast here.
Heating vs. cooling in Swain County
Split it out and it's roughly $1,610 a year on the heating side, $23 on cooling. By estimated insulation savings, Swain County lands in the 62th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Swain County comes in 21st by savings. North Carolina averages $1,169/year across the counties tracked here; Swain County comes in 40% higher.
The climate data behind this
NOAA's NEWFOUND GAP, TN US station, 3.6 miles from Swain County, supplies the 6,021 HDD and 143 CDD this estimate runs on. By total degree days, Swain County sits at the 55th percentile nationally. One local detail the R-value alone won't tell you: Swain County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
The smaller top-up scenario
If Swain County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-49. That smaller top-up costs around $2,280 and saves an estimated $238/year — payback about 9.6 years. Call this borderline rather than a clear win.
Getting it done in Swain County
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $3,480 figure above as a planning number for Swain County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Swain 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.