Claiborne Parish, LA Insulation Payback
Claiborne Parish, LA: what topping up your attic actually costs
DOE classifies Claiborne Parish as climate zone 3, hot-humid — humid heat for much of the year, with cooling running far more than heating ever does. Its recommended attic R-value for bare joists is 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 2.7 years at an estimated $1,056/year saved. That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $736/year heating, $320/year cooling. Out of every 100 US counties tracked here, Claiborne Parish's savings potential beats roughly 21 of them. Within zone 3 specifically, it ranks 342nd of 690 counties by estimated savings. Louisiana averages $906/year across the counties tracked here; Claiborne Parish comes in 17% higher.
The climate data behind this
NOAA's HOMER 1N, LA US station, 4.4 miles from Claiborne Parish, supplies the 2,774 HDD and 2,010 CDD this estimate runs on. By total degree days, Claiborne Parish sits at the 19th percentile nationally. Claiborne Parish falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $142/year saved — roughly 11.4 years to break even. This one is a genuine toss-up, not a clear yes.
Quotes and materials for this job
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 Claiborne Parish 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.