Plaquemines Parish, LA Insulation Payback
Attic insulation payback for Plaquemines Parish, LA
DOE classifies Plaquemines Parish as climate zone 2, hot-humid — summers that stay hot and humid while winters barely register on the energy bill. 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 $757 a year — payback in roughly 3.7 years. Worth doing on the numbers alone.
Where the savings come from
Of that, about $280/year comes from reduced heating and $477/year from reduced cooling load through the ceiling. Plaquemines Parish beats 3% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 233 counties DOE places in zone 2, Plaquemines Parish ranks 200th. Against Louisiana's own average of $906/year, Plaquemines Parish runs 16% below that.
Plaquemines Parish's actual weather, not a national average
NOAA's BURAS, LA US station, 5.5 miles from Plaquemines Parish, supplies the 1,054 HDD and 2,995 CDD this estimate runs on. That combined heating-and-cooling load ranks Plaquemines Parish 3078th nationally by total degree days — the 3th percentile. DOE also classifies Plaquemines Parish as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
The smaller top-up scenario
If Plaquemines Parish'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 $102/year — payback about 15.9 years. It is close - the payback only just fits a reasonable timeframe.
Getting it done in Plaquemines Parish
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 Plaquemines Parish, 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.