Detroit Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 5A (cold-humid). Detroit's Great Lakes position produces cold winters (6°F heating design), hot humid summers (88°F/72°F cooling design), and meaningful lake-effect snow and weather events.

Energy Code & Manual J Requirement: Michigan Residential Building Code (IECC 2021, some jurisdictions adopting 2021). ACCA Manual J required for residential HVAC permits across all Detroit metro jurisdictions.

Local Electric Utility: DTE Energy

Building Department: City of Detroit Buildings, Safety Engineering & Environmental Department (BSEED)

Local Trade Association: ACCA Michigan Chapter / ASHRAE Michigan Chapter / SMACNA Michigan