Corozal Municipio, PR Insulation Payback
Corozal Municipio, PR: what topping up your attic actually costs
Corozal Municipio sits in IECC climate zone 1 (Hot-Humid) — long, muggy summers and mild winters, where cooling dominates the energy bill. For a currently uninsulated attic, DOE and ENERGY STAR recommend building 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 $706 a year — payback in roughly 2.4 years. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $0/year heating, $706/year cooling. Out of every 100 US counties tracked here, Corozal Municipio's savings potential beats roughly 2 of them. Within zone 1 specifically, it ranks 39th of 81 counties by estimated savings. Puerto Rico averages $660/year across the counties tracked here; Corozal Municipio comes in 7% higher.
Corozal Municipio's actual weather, not a national average
The heating and cooling degree days behind this estimate — 0 HDD and 4,550 CDD (base 65°F, 1991-2020 normals) — come from PALMAREJO VEGA BAJA, PR RQ, the nearest NOAA station with published normals, 8.8 miles from Corozal Municipio's center. By total degree days, Corozal Municipio sits at the 13th percentile nationally. Corozal Municipio falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
The smaller top-up scenario
If Corozal 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 $77/year — payback about 10.9 years. This one is a genuine toss-up, not a clear yes.
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 Corozal Municipio job, not a quote. Expect at least a $600 minimum charge from most contractors.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-30 is the target here specifically.