Montgomery County, MS Insulation Payback
Montgomery County attic insulation, by the numbers
Montgomery County sits in IECC climate zone 3 (Mixed-Humid) — a genuine mix of cold winters and humid summers, with neither one dominating the bill. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-49. Going from R-2 to the recommended R-49 costs roughly $2,820 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2.5 years at an estimated $1,132/year saved. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $877 a year on the heating side, $255 on cooling. By estimated insulation savings, Montgomery County lands in the 27th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Montgomery County comes in 190th by savings. Mississippi averages $1,022/year across the counties tracked here; Montgomery County comes in 11% higher.
The climate data behind this
The heating and cooling degree days behind this estimate — 3,305 HDD and 1,603 CDD (base 65°F, 1991-2020 normals) — come from WINONA 5 E, MS US, the nearest NOAA station with published normals, 1.4 miles from Montgomery County's center. That combined heating-and-cooling load ranks Montgomery County 2437th nationally by total degree days — the 23th percentile. One local detail the R-value alone won't tell you: Montgomery County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
Already have some insulation?
If Montgomery 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.
Getting it done in Montgomery 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 Montgomery County's estimated $1,132/year on the line.
Where these figures come from
Montgomery 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.