Burlington County, NJ Insulation Payback
Is attic insulation worth it in Burlington County, NJ?
Burlington County, New Jersey is zone 4 under DOE's climate map (Mixed-Humid), which means real heating and real cooling seasons both, roughly balanced across the year. An uninsulated attic there should be built 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 $1,480 a year — payback in roughly 2.4 years. Few home upgrades pay back that quickly.
Heating vs. cooling in Burlington County
Heating accounts for about $1,321/year of that and cooling about $159/year — Burlington County needs both. Nationally, Burlington County ranks in the 52th percentile for insulation savings potential. Compared only against its own climate zone, Burlington County places 207th out of 825. Against New Jersey's own average of $1,541/year, Burlington County runs 4% below that.
The climate data behind this
The heating and cooling degree days behind this estimate — 4,940 HDD and 989 CDD (base 65°F, 1991-2020 normals) — come from INDIAN MILLS 2 W, NJ US, the nearest NOAA station with published normals, 8.2 miles from Burlington County's center. That combined heating-and-cooling load ranks Burlington County 1581st nationally by total degree days — the 50th percentile. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
The smaller top-up scenario
If Burlington 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 $216/year — payback about 10.6 years. Whether that is worth it depends on how long you plan to stay.
Getting it done in Burlington County
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 Burlington County's estimated $1,480/year on the line.
Burlington County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Burlington County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.