Scott County, MS Insulation Payback
Scott County, MS: what topping up your attic actually costs
DOE classifies Scott County as climate zone 3, mixed-humid — heating load in winter and cooling load in summer, both worth taking seriously here. 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 $963 a year — payback in roughly 2.9 years. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $661/year heating, $302/year cooling. Out of every 100 US counties tracked here, Scott County's savings potential beats roughly 14 of them. Within zone 3 specifically, it ranks 549th of 690 counties by estimated savings. Mississippi averages $1,022/year across the counties tracked here; Scott County comes in 6% lower.
Scott County's actual weather, not a national average
Scott County's climate figures — 2,492 heating and 1,895 cooling degree days a year — are read from FOREST, MS US, 7.5 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Scott County in the 8th percentile of this 3,162-county dataset. Scott County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
If the attic isn't bare
If Scott 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 $130/year — payback about 12.5 years. This one is a genuine toss-up, not a clear yes.
Next steps for a Scott 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 Scott 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.