Ouachita Parish, LA Insulation Payback
Is attic insulation worth it in Ouachita Parish, LA?
Ouachita Parish sits in IECC climate zone 3 (Hot-Humid) — long, muggy summers and mild winters, where cooling dominates the energy 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 2.9 years at an estimated $985/year saved. Few home upgrades pay back that quickly.
Where the savings come from
Heating accounts for about $587/year of that and cooling about $398/year — Ouachita Parish needs both. Nationally, Ouachita Parish ranks in the 16th percentile for insulation savings potential. Compared only against its own climate zone, Ouachita Parish places 499th out of 690. Against Louisiana's own average of $906/year, Ouachita Parish runs 9% above that.
Ouachita Parish's actual weather, not a national average
The heating and cooling degree days behind this estimate — 2,213 HDD and 2,495 CDD (base 65°F, 1991-2020 normals) — come from MONROE RGNL AP, LA US, the nearest NOAA station with published normals, 6.9 miles from Ouachita Parish's center. Combined heating and cooling load puts Ouachita Parish in the 17th percentile of this 3,162-county dataset. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $133/year saved — roughly 12.2 years to break even. Whether that is worth it depends on how long you plan to stay.
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 Ouachita Parish, not a bid - contractors typically charge a $600 minimum regardless of job size.
Ouachita Parish's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Ouachita Parish's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.