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United States map image: Tapered design map showing all three Tapered Design regions: West and International, North, and South.

IECC climate zones

The IECC sets efficiency standards for new structures based on nationwide climate zones. Requirements change according to how far north or south the structure is, and zones generally align with county lines for ease of compliance.
Climate Zone tool
Figure R301.1, Climate Zones, is excerpted from the 2021 International Energy ConservationCode. Copyright © 2021. International Code Council, Inc. All rights reserved. Reproduced with permission. www.ICCSAFE.org.