Cayey Municipio, PR Insulation Payback
Is attic insulation worth it in Cayey Municipio, PR?
Cayey Municipio, Puerto Rico is zone 1 under DOE's climate map (Hot-Humid), which means long, muggy summers and mild winters, where cooling dominates the energy bill. An uninsulated attic there should be built up to R-30. Going from R-2 to the recommended R-30 costs roughly $1,680 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 4.3 years at an estimated $395/year saved. That is a solid payback as home upgrades go.
Heating vs. cooling in Cayey Municipio
Heating accounts for about $7/year of that and cooling about $388/year — Cayey Municipio needs both. Nationally, Cayey Municipio ranks in the 0th percentile for insulation savings potential. Compared only against its own climate zone, Cayey Municipio places 66th out of 81. Against Puerto Rico's own average of $660/year, Cayey Municipio runs 40% below that.
Cayey Municipio's actual weather, not a national average
NOAA's AIBONITO 1 S, PR RQ station, 7.6 miles from Cayey Municipio, supplies the 27 HDD and 2,502 CDD this estimate runs on. Combined heating and cooling load puts Cayey Municipio in the 1th percentile of this 3,162-county dataset. 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.
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 $43/year saved (~19.5-year payback). Whether that is worth it depends on how long you plan to stay.
Getting it done in Cayey Municipio
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 Cayey Municipio's estimated $395/year on the line.
Cayey Municipio's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Cayey 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.