Franklin County, FL Insulation Payback
Franklin County, FL: what topping up your attic actually costs
Franklin County sits in IECC climate zone 2 (Hot-Humid) — long, muggy summers and mild winters, where cooling dominates the energy bill. 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 $777 a year — payback in roughly 3.6 years. The math clears comfortably within a normal ownership horizon.
Heating vs. cooling in Franklin County
The estimated savings split roughly $324/year heating, $454/year cooling. Out of every 100 US counties tracked here, Franklin County's savings potential beats roughly 4 of them. Within zone 2 specifically, it ranks 186th of 233 counties by estimated savings. Florida averages $743/year across the counties tracked here; Franklin County comes in 5% higher.
Franklin County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 1,220 HDD and 2,846 CDD (base 65°F, 1991-2020 normals) — come from APALACHICOLA AIRPORT, FL US, the nearest NOAA station with published normals, 12.8 miles from Franklin County's center. By total degree days, Franklin County sits at the 3th percentile nationally. Franklin 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
A shallower starting point changes the math: with R-11 already down, only the gap to R-38 needs filling, at roughly $1,620 for an estimated $105/year saved (~15.5-year payback). This one is a genuine toss-up, not a clear yes.
Getting it done in Franklin County
Get more than one quote before committing. Attic access and any needed air sealing move the price around, and most contractors won't take a job below roughly $600 regardless of size - worth asking upfront given Franklin County's estimated $777/year on the line.
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.