IECC 2021 · PNNL
New Jersey climate zones
New Jersey’s 21 counties fall in 2 IECC 2021 climate zones: 4A (13), 5A (8).
Zone 4A: mixed-humid
Attic target R60 (ENERGY STAR)Atlantic County (Mixed-humid) · Burlington County (Mixed-humid) · Camden County (Mixed-humid) · Cape May County (Mixed-humid) · Cumberland County (Mixed-humid) · Essex County (Mixed-humid) · Gloucester County (Mixed-humid) · Hudson County (Mixed-humid) · Middlesex County (Mixed-humid) · Monmouth County (Mixed-humid) · Ocean County (Mixed-humid) · Salem County (Mixed-humid) · Union County (Mixed-humid)
Zone 5A: cool-humid
Attic target R60 (ENERGY STAR)Bergen County (Cold) · Hunterdon County (Cold) · Mercer County (Cold) · Morris County (Cold) · Passaic County (Cold) · Somerset County (Cold) · Sussex County (Cold) · Warren County (Cold)