Effingham County, GA Insulation Payback
Effingham County attic insulation, by the numbers
Effingham County sits in IECC climate zone 2 (Hot-Humid) — humid heat for much of the year, with cooling running far more than heating ever does. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-49. For an attic around 1,000 square feet, closing the gap from R-2 to R-49 costs around $2,820 and saves an estimated $858 a year — payback in roughly 3.3 years. Topping up the attic pays for itself here.
The breakdown behind the number
Split it out and it's roughly $444 a year on the heating side, $414 on cooling. By estimated insulation savings, Effingham County lands in the 7th percentile nationally. Zone 2 alone covers 233 counties in this dataset, and Effingham County comes in 99th by savings. Georgia averages $974/year across the counties tracked here; Effingham County comes in 12% lower.
Where these numbers come from
NOAA's SAVANNAH INTL AP, GA US station, 17.8 miles from Effingham County, supplies the 1,675 HDD and 2,596 CDD this estimate runs on. That combined heating-and-cooling load ranks Effingham County 2979th nationally by total degree days — the 6th percentile. One local detail the R-value alone won't tell you: Effingham County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $116/year saved — roughly 14 years to break even. Call this borderline rather than a clear win.
Getting it done in Effingham 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 Effingham County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Effingham 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.