Cataño Municipio, PR Insulation Payback
Cataño Municipio attic insulation, by the numbers
DOE classifies Cataño Municipio as climate zone 1, 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-30. For an attic around 1,000 square feet, closing the gap from R-2 to R-30 costs around $1,680 and saves an estimated $821 a year — payback in roughly 2 years. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $0 a year on the heating side, $821 on cooling. By estimated insulation savings, Cataño Municipio lands in the 5th percentile nationally. Zone 1 alone covers 81 counties in this dataset, and Cataño Municipio comes in 17th by savings. Puerto Rico averages $660/year across the counties tracked here; Cataño Municipio comes in 24% higher.
Cataño Municipio's actual weather, not a national average
Cataño Municipio's climate figures — 0 heating and 5,296 cooling degree days a year — are read from TOA BAJA LEVITTOWN, PR RQ, 1.4 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Cataño Municipio sits at the 34th percentile nationally. One local detail the R-value alone won't tell you: Cataño Municipio sits in moisture regime A (humid), which can affect the vapor-barrier choice.
If the attic isn't bare
A shallower starting point changes the math: with R-11 already down, only the gap to R-25 needs filling, at roughly $840 for an estimated $90/year saved (~9.4-year payback). Call this borderline rather than a clear win.
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 $1,680 as a starting estimate for a Cataño Municipio job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Cataño Municipio's R-30 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-30 is the target here specifically.