Birmingham Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 3A (mixed-humid). Birmingham has a humid subtropical climate with hot summers, moderate-to-significant humidity, and variable winters with occasional freezing events. Heating design temperatures around 22°F reflect periodic cold snaps common to the Birmingham area.

Energy Code & Manual J Requirement: Alabama has adopted IECC 2015 for residential energy compliance. ACCA Manual J is required for HVAC equipment sizing across Alabama jurisdictions. Jefferson County and surrounding metro counties enforce these requirements through their building departments.

Local Electric Utility: Alabama Power (Southern Company)

Building Department: Jefferson County Building Inspections / City of Birmingham Building Inspection

Local Trade Association: ACCA Alabama Chapter / ASHRAE Birmingham Chapter