Las Piedras Municipio, PR Insulation Payback
Is attic insulation worth it in Las Piedras Municipio, PR?
DOE classifies Las Piedras Municipio as climate zone 1, hot-humid — long, muggy summers and mild winters, where cooling dominates the energy bill. 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 $701 a year — payback in roughly 2.4 years. Few home upgrades pay back that quickly.
Heating vs. cooling in Las Piedras Municipio
Heating accounts for about $0/year of that and cooling about $700/year — Las Piedras Municipio needs both. Nationally, Las Piedras Municipio ranks in the 2th percentile for insulation savings potential. Compared only against its own climate zone, Las Piedras Municipio places 47th out of 81. Against Puerto Rico's own average of $660/year, Las Piedras Municipio runs 6% above that.
The climate data behind this
The heating and cooling degree days behind this estimate — 1 HDD and 4,516 CDD (base 65°F, 1991-2020 normals) — come from JUNCOS 1 SE, PR RQ, the nearest NOAA station with published normals, 3.8 miles from Las Piedras Municipio's center. That combined heating-and-cooling load ranks Las Piedras Municipio 2792nd nationally by total degree days — the 12th percentile. 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
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 $76/year saved (~11-year payback). Whether that is worth it depends on how long you plan to stay.
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 Las Piedras Municipio job, not a quote. Expect at least a $600 minimum charge from most contractors.
Las Piedras Municipio's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Las Piedras Municipio'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.