Cape May County, NJ Insulation Payback
Cape May County attic insulation, by the numbers
Cape May County sits in IECC climate zone 4 (Mixed-Humid) — heating load in winter and cooling load in summer, both worth taking seriously here. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-60. For an attic around 1,000 square feet, closing the gap from R-2 to R-60 costs around $3,480 and saves an estimated $1,347 a year — payback in roughly 2.6 years. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $1,158 a year on the heating side, $189 on cooling. By estimated insulation savings, Cape May County lands in the 42th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Cape May County comes in 494th by savings. New Jersey averages $1,541/year across the counties tracked here; Cape May County comes in 13% lower.
Cape May County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 4,332 HDD and 1,176 CDD (base 65°F, 1991-2020 normals) — come from CAPE MAY 2 NW, NJ US, the nearest NOAA station with published normals, 10.3 miles from Cape May County's center. Combined heating and cooling load puts Cape May County in the 40th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: Cape May County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
The smaller top-up scenario
If Cape May County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-49. That smaller top-up costs around $2,280 and saves an estimated $197/year — payback about 11.6 years. Call this borderline rather than a clear win.
Getting it done in Cape May County
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $3,480 as a starting estimate for a Cape May County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Cape May County's R-60 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-60 is the target here specifically.