Cherokee County, NC Insulation Payback
Cherokee County attic insulation, by the numbers
DOE classifies Cherokee County as climate zone 4, mixed-humid — a genuine mix of cold winters and humid summers, with neither one dominating the bill. Its recommended attic R-value for bare joists is R-60. For an attic around 1,000 square feet, closing the gap from R-2 to R-60 costs around $3,480 and saves an estimated $1,247 a year — payback in roughly 2.8 years. Topping up the attic pays for itself fast here.
Heating vs. cooling in Cherokee County
Split it out and it's roughly $1,080 a year on the heating side, $167 on cooling. By estimated insulation savings, Cherokee County lands in the 34th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Cherokee County comes in 692nd by savings. North Carolina averages $1,169/year across the counties tracked here; Cherokee County comes in 7% higher.
The climate data behind this
The heating and cooling degree days behind this estimate — 4,041 HDD and 1,038 CDD (base 65°F, 1991-2020 normals) — come from MURPHY 4ESE, NC US, the nearest NOAA station with published normals, 7 miles from Cherokee County's center. By total degree days, Cherokee County sits at the 28th percentile nationally. One local detail the R-value alone won't tell you: Cherokee County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
If the attic isn't bare
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $182/year saved — roughly 12.5 years to break even. 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 Cherokee County's estimated $1,247/year on the line.
Where these figures come from
Cherokee 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.