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IECC 2021 · PNNL

Massachusetts climate zones

Massachusetts’s 14 counties fall in 1 IECC 2021 climate zone: 5A (14).

Zone 5A: cool-humid

Attic target R60 (ENERGY STAR)

Barnstable County (Cold) · Berkshire County (Cold) · Bristol County (Cold) · Dukes County (Cold) · Essex County (Cold) · Franklin County (Cold) · Hampden County (Cold) · Hampshire County (Cold) · Middlesex County (Cold) · Nantucket County (Cold) · Norfolk County (Cold) · Plymouth County (Cold) · Suffolk County (Cold) · Worcester County (Cold)

PNNL county zonesENERGY STAR insulation