Vega Baja Municipio, PR Insulation Payback
Vega Baja Municipio, PR: what topping up your attic actually costs
Vega Baja Municipio sits in IECC climate zone 1 (Hot-Humid) — humid heat for much of the year, with cooling running far more than heating ever does. For a currently uninsulated attic, DOE and ENERGY STAR recommend building 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 2.5 years at an estimated $672/year saved. That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $0/year heating, $672/year cooling. Out of every 100 US counties tracked here, Vega Baja Municipio's savings potential beats roughly 1 of them. Within zone 1 specifically, it ranks 56th of 81 counties by estimated savings. Puerto Rico averages $660/year across the counties tracked here; Vega Baja Municipio comes in 2% higher.
The climate data behind this
The heating and cooling degree days behind this estimate — 0 HDD and 4,335 CDD (base 65°F, 1991-2020 normals) — come from MANATI 2 E, PR RQ, the nearest NOAA station with published normals, 4.8 miles from Vega Baja Municipio's center. Combined heating and cooling load puts Vega Baja Municipio in the 7th percentile of this 3,162-county dataset. Vega Baja 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 Vega Baja 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 $73/year — payback about 11.5 years. This one is a genuine toss-up, not a clear yes.
Getting it done in Vega Baja 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 Vega Baja Municipio, not a bid - contractors typically charge a $600 minimum regardless of job size.
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.