Naranjito Municipio, PR Insulation Payback
Naranjito Municipio attic insulation, by the numbers
DOE classifies Naranjito 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. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-30 runs an estimated $1,680, and saves about $395 a year in heating and cooling — a payback around 4.3 years. Topping up the attic pays for itself here.
Heating vs. cooling in Naranjito Municipio
Split it out and it's roughly $7 a year on the heating side, $388 on cooling. By estimated insulation savings, Naranjito Municipio lands in the 0th percentile nationally. Zone 1 alone covers 81 counties in this dataset, and Naranjito Municipio comes in 70th by savings. Puerto Rico averages $660/year across the counties tracked here; Naranjito Municipio comes in 40% lower.
Naranjito Municipio's actual weather, not a national average
NOAA's AIBONITO 1 S, PR RQ station, 11.2 miles from Naranjito Municipio, supplies the 27 HDD and 2,502 CDD this estimate runs on. By total degree days, Naranjito Municipio sits at the 0th percentile nationally. One local detail the R-value alone won't tell you: Naranjito Municipio sits in moisture regime A (humid), which can affect the vapor-barrier choice.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-25 runs about $840 for about $43/year saved — roughly 19.5 years to break even. Call this borderline rather than a clear win.
Getting it done in Naranjito Municipio
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $1,680 figure above as a planning number for Naranjito Municipio, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Naranjito 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.