IECC 2021 · PNNL
Maine climate zones
Maine’s 16 counties fall in 2 IECC 2021 climate zones: 6A (15), 7 (1).
Zone 6A: cold-humid
Attic target R60 (ENERGY STAR)Androscoggin County (Cold) · Cumberland County (Cold) · Franklin County (Cold) · Hancock County (Cold) · Kennebec County (Cold) · Knox County (Cold) · Lincoln County (Cold) · Oxford County (Cold) · Penobscot County (Cold) · Piscataquis County (Cold) · Sagadahoc County (Cold) · Somerset County (Cold) · Waldo County (Cold) · Washington County (Cold) · York County (Cold)
Zone 7: very cold
Attic target R60 (ENERGY STAR)Aroostook County (Very cold)