Marion County, AL Insulation Payback
Marion County attic insulation, by the numbers
Marion County sits in IECC climate zone 3 (Mixed-Humid) — real heating and real cooling seasons both, roughly balanced across the year. 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 $1,160 a year — payback in roughly 2.4 years.
Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $876 a year on the heating side, $284 on cooling. By estimated insulation savings, Marion County lands in the 28th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Marion County comes in 145th by savings. Alabama averages $1,001/year across the counties tracked here; Marion County comes in 16% higher.
Where these numbers come from
Marion County's climate figures — 3,303 heating and 1,781 cooling degree days a year — are read from Hamilton 3 S, AL US, 6.9 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Marion County in the 28th percentile of this 3,171-county dataset. One local detail the R-value alone won't tell you: Marion County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
If the attic isn't bare
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 $156/year saved (~10.4-year payback). Call this borderline rather than a clear win.
Next steps for a Marion County attic
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 Marion County job, not a quote. You should get more than one quote before signing anything - expect at least a $600 minimum charge from most contractors.
Where these figures come from
Marion 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.