Jasper County, MS Insulation Payback
Jasper County, MS: what topping up your attic actually costs
Jasper County sits in IECC climate zone 3 (Mixed-Humid) — heating load in winter and cooling load in summer, both worth taking seriously here. 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 2.8 years at an estimated $1,002/year saved. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $655/year heating, $347/year cooling. Out of every 100 US counties tracked here, Jasper County's savings potential beats roughly 17 of them. Within zone 3 specifically, it ranks 468th of 690 counties by estimated savings. Mississippi averages $1,022/year across the counties tracked here; Jasper County comes in 2% lower.
Where these numbers come from
NOAA's NEWTON EXP STN, MS US station, 22.3 miles from Jasper County, supplies the 2,469 HDD and 2,175 CDD this estimate runs on. Combined heating and cooling load puts Jasper County in the 15th percentile of this 3,162-county dataset. Jasper 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 $135/year saved (~12-year payback). This one is a genuine toss-up, not a clear yes.
Quotes and materials for this job
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 Jasper County's estimated $1,002/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.