Guayama Municipio, PR Insulation Payback
Attic insulation payback for Guayama Municipio, PR
Guayama Municipio, Puerto Rico is zone 1 under DOE's climate map (Hot-Humid), which means summers that stay hot and humid while winters barely register on the energy bill. 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 $924 a year — payback in roughly 1.8 years. Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $0/year comes from reduced heating and $924/year from reduced cooling load through the ceiling. Guayama Municipio beats 11% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 81 counties DOE places in zone 1, Guayama Municipio ranks 4th. Against Puerto Rico's own average of $660/year, Guayama Municipio runs 40% above that.
Where these numbers come from
NOAA's GUAYAMA 2E, PR RQ station, 3.3 miles from Guayama Municipio, supplies the 0 HDD and 5,958 CDD this estimate runs on. That combined heating-and-cooling load ranks Guayama Municipio 1559th nationally by total degree days — the 51th percentile. DOE also classifies Guayama Municipio as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
If the attic isn't bare
Already have a few inches up there? Topping R-11 up to R-25 runs about $840 for about $101/year saved — roughly 8.3 years to break even. It is close - the payback only just fits a reasonable timeframe.
Getting it done in Guayama 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 Guayama Municipio's estimated $924/year on the line.
More on how this was built
Nothing here is a guess: the methodology guide names the DOE climate map and NOAA station data behind every number on this page. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.