Flint Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 5A (cold-humid). Flint's mid-Michigan inland position produces a colder heating design (1°F) than the Detroit metro — further from Great Lakes moderation. Hot, humid summers with 89°F/73°F cooling design still require meaningful cooling system capacity.

Energy Code & Manual J Requirement: Michigan Residential Energy Code (aligned with IECC 2021). ACCA Manual J required for HVAC permits in Genesee County and Flint metro jurisdictions.

Local Electric Utility: Consumers Energy

Building Department: City of Flint Building Department

Local Trade Association: ACCA Michigan Chapter