Grand Rapids Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 5A (cold-humid). Grand Rapids's proximity to Lake Michigan produces significant lake-effect precipitation, cold winters (5°F heating design), and somewhat cooler summers than Michigan's interior due to lake breezes.

Energy Code & Manual J Requirement: Michigan Residential Building Code (IECC 2021). ACCA Manual J required for Kent County and all Grand Rapids area HVAC permits.

Local Electric Utility: Consumers Energy

Building Department: City of Grand Rapids Building Safety Department

Local Trade Association: ACCA Michigan Chapter / ASHRAE Michigan Chapter