IECC Climate Zone 6 — Cold

Updated Mar 26, 2026

Cold northern climate covering northern states, Great Lakes, and northern New England. Heating-dominated with high insulation requirements. Air sealing critical — max 3 ACH50 per IECC.

TAGS

IECC cold northern heating air-sealing

DETAILS

hdd range

7,000-8,000

iecc zone

air tightness

3 ACH50 max

example cities

Minneapolis, Burlington VT, Duluth, Bangor ME

roof insulation

R-49 to R-60

wall insulation

R-20+R-5ci or R-13+R-10ci

SOURCES

🔗https://codes.iccsafe.org/content/IECC2021P1

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