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IECC 2021 · PNNL

Delaware climate zones

Delaware’s 3 counties fall in 1 IECC 2021 climate zone: 4A (3).

Zone 4A: mixed-humid

Attic target R60 (ENERGY STAR)

Kent County (Mixed-humid) · New Castle County (Mixed-humid) · Sussex County (Mixed-humid)

PNNL county zonesENERGY STAR insulation