Winston County, AL Insulation Payback
Winston County attic insulation, by the numbers
DOE classifies Winston County as climate zone 3, mixed-humid — real heating and real cooling seasons both, roughly balanced across the year. Its recommended attic R-value for bare joists is 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 $1,136 a year — payback in roughly 2.5 years. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $901 a year on the heating side, $235 on cooling. By estimated insulation savings, Winston County lands in the 27th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Winston County comes in 181st by savings. Alabama averages $1,001/year across the counties tracked here; Winston County comes in 13% higher.
Where these numbers come from
The heating and cooling degree days behind this estimate — 3,397 HDD and 1,475 CDD (base 65°F, 1991-2020 normals) — come from ADDISON, AL US, the nearest NOAA station with published normals, 12.6 miles from Winston County's center. By total degree days, Winston County sits at the 22th percentile nationally. One local detail the R-value alone won't tell you: Winston County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
Already have some insulation?
If Winston 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 $153/year — payback about 10.6 years. Call this borderline rather than a clear win.
Quotes and materials for this job
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $2,820 figure above as a planning number for Winston County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Winston 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.