Franklin County, GA Insulation Payback
Franklin County attic insulation, by the numbers
DOE classifies Franklin County as climate zone 4, mixed-humid — real heating and real cooling seasons both, roughly balanced across the year. 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 $1,062 a year in heating and cooling — a payback around 3.3 years. Topping up the attic pays for itself here.
The breakdown behind the number
Split it out and it's roughly $789 a year on the heating side, $273 on cooling. By estimated insulation savings, Franklin County lands in the 21th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Franklin County comes in 821st by savings. Georgia averages $974/year across the counties tracked here; Franklin County comes in 9% higher.
Where these numbers come from
NOAA's TOCCOA, GA US station, 15.3 miles from Franklin County, supplies the 2,949 HDD and 1,700 CDD this estimate runs on. By total degree days, Franklin County sits at the 15th percentile nationally. One local detail the R-value alone won't tell you: Franklin County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
Already have some insulation?
If Franklin 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 $155/year — payback about 14.7 years. Call this borderline rather than a clear win.
Quotes and materials for this job
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $3,480 as a starting estimate for a Franklin County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Franklin 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.