Jeff Davis County, GA Insulation Payback
Jeff Davis County attic insulation, by the numbers
DOE classifies Jeff Davis County as climate zone 2, hot-humid — summers that stay hot and humid while winters barely register on the energy bill. Its recommended attic R-value for bare joists is R-49. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-49 runs an estimated $2,820, and saves about $886 a year in heating and cooling — a payback around 3.2 years. Topping up the attic pays for itself here.
Heating vs. cooling in Jeff Davis County
Split it out and it's roughly $509 a year on the heating side, $377 on cooling. By estimated insulation savings, Jeff Davis County lands in the 9th percentile nationally. Zone 2 alone covers 233 counties in this dataset, and Jeff Davis County comes in 58th by savings. Georgia averages $974/year across the counties tracked here; Jeff Davis County comes in 9% lower.
Where these numbers come from
The heating and cooling degree days behind this estimate — 1,920 HDD and 2,366 CDD (base 65°F, 1991-2020 normals) — come from HAZLEHURST, GA US, the nearest NOAA station with published normals, 6.2 miles from Jeff Davis County's center. By total degree days, Jeff Davis County sits at the 6th percentile nationally. One local detail the R-value alone won't tell you: Jeff Davis County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $119/year saved — roughly 13.6 years to break even. Call this borderline rather than a clear win.
Getting it done in Jeff Davis County
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $2,820 as a starting estimate for a Jeff Davis County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Jeff Davis County's R-49 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-49 is the target here specifically.