McIntosh County, GA Insulation Payback
McIntosh County, GA: what topping up your attic actually costs
McIntosh 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 $807 a year — payback in roughly 3.5 years. The math clears comfortably within a normal ownership horizon.
The breakdown behind the number
The estimated savings split roughly $378/year heating, $429/year cooling. Out of every 100 US counties tracked here, McIntosh County's savings potential beats roughly 4 of them. Within zone 2 specifically, it ranks 168th of 233 counties by estimated savings. Georgia averages $974/year across the counties tracked here; McIntosh County comes in 17% lower.
McIntosh County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 1,424 HDD and 2,690 CDD (base 65°F, 1991-2020 normals) — come from SAPELO IS, GA US, the nearest NOAA station with published normals, 8.1 miles from McIntosh County's center. Combined heating and cooling load puts McIntosh County in the 3th percentile of this 3,162-county dataset. McIntosh County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
Already have some insulation?
If McIntosh County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-38. That smaller top-up costs around $1,620 and saves an estimated $109/year — payback about 14.9 years. This one is a genuine toss-up, not a clear yes.
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 $2,820 as a starting estimate for a McIntosh County job, not a quote. Expect at least a $600 minimum charge from most contractors.
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-49 is the target here specifically.