Laurens County, SC Insulation Payback
Attic insulation payback for Laurens County, SC
Laurens County, South Carolina is zone 3 under DOE's climate map (Mixed-Humid), which means heating load in winter and cooling load in summer, both worth taking seriously here. An uninsulated attic there should be built 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 $1,117 a year — payback in roughly 2.5 years. Hard to find a home improvement with a faster payback than this.
The breakdown behind the number
Of that, about $832/year comes from reduced heating and $285/year from reduced cooling load through the ceiling. Laurens County beats 25% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 690 counties DOE places in zone 3, Laurens County ranks 218th. Against South Carolina's own average of $1,016/year, Laurens County runs 10% above that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 3,135 HDD and 1,788 CDD (base 65°F, 1991-2020 normals) — come from LAURENS, SC US, the nearest NOAA station with published normals, 1.4 miles from Laurens County's center. Combined heating and cooling load puts Laurens County in the 24th percentile of this 3,162-county dataset. DOE also classifies Laurens County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
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 $150/year saved (~10.8-year payback). It is close - the payback only just fits a reasonable timeframe.
Next steps for a Laurens County attic
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 Laurens County, not a bid - contractors typically charge a $600 minimum regardless of job size.
More on how this was built
Nothing here is a guess: the methodology guide names the DOE climate map and NOAA station data behind every number on this page. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.