Loíza Municipio, PR Insulation Payback
Is attic insulation worth it in Loíza Municipio, PR?
Loíza Municipio, Puerto Rico is zone 1 under DOE's climate map (Hot-Humid), which means humid heat for much of the year, with cooling running far more than heating ever does. An uninsulated attic there should be built up to 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 $843 a year — payback in roughly 2 years. Few home upgrades pay back that quickly.
The breakdown behind the number
Heating accounts for about $0/year of that and cooling about $843/year — Loíza Municipio needs both. Nationally, Loíza Municipio ranks in the 6th percentile for insulation savings potential. Compared only against its own climate zone, Loíza Municipio places 15th out of 81. Against Puerto Rico's own average of $660/year, Loíza Municipio runs 28% above that.
Where these numbers come from
NOAA's WFO SAN JUAN, PR RQ station, 3.4 miles from Loíza Municipio, supplies the 0 HDD and 5,433 CDD this estimate runs on. By total degree days, Loíza Municipio sits at the 38th percentile nationally. 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
If Loíza Municipio's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-25. That smaller top-up costs around $840 and saves an estimated $92/year — payback about 9.1 years. Whether that is worth it depends on how long you plan to stay.
Quotes and materials for this job
Get more than one quote before committing. Attic access and any needed air sealing move the price around, and most contractors won't take a job below roughly $600 regardless of size - worth asking upfront given Loíza Municipio's estimated $843/year on the line.
Loíza Municipio's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Loíza 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.