Transylvania County, NC Insulation Payback
Transylvania County, NC: what topping up your attic actually costs
Transylvania County sits in IECC climate zone 4 (Mixed-Humid) — real heating and real cooling seasons both, roughly balanced across the year. For a currently uninsulated attic, DOE and ENERGY STAR recommend building 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 2.7 years at an estimated $1,269/year saved. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $1,150/year heating, $119/year cooling. Out of every 100 US counties tracked here, Transylvania County's savings potential beats roughly 36 of them. Within zone 4 specifically, it ranks 643rd of 825 counties by estimated savings. North Carolina averages $1,169/year across the counties tracked here; Transylvania County comes in 9% higher.
The climate data behind this
NOAA's BREVARD, NC US station, 4.7 miles from Transylvania County, supplies the 4,302 HDD and 740 CDD this estimate runs on. That combined heating-and-cooling load ranks Transylvania County 2303rd nationally by total degree days — the 27th percentile. Transylvania County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $185/year saved — roughly 12.3 years to break even. This one is a genuine toss-up, not a clear yes.
Quotes and materials for this job
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 Transylvania County, not a bid - contractors typically charge a $600 minimum regardless of job size.
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-60 is the target here specifically.