Huntsville Climate Zone & Energy Code
Climate Zone: IECC Climate Zone 4A (mixed-humid). Huntsville's north Alabama location produces colder winters than Birmingham, with a heating design temperature of 17°F and meaningful ice storm risk. Summers are hot and humid, with both sensible and latent cooling loads requiring careful Manual J analysis.
Energy Code & Manual J Requirement: Alabama IECC 2015. ACCA Manual J required for residential HVAC permits in Madison County and all Huntsville-area jurisdictions. The City of Huntsville has a robust building inspection program consistent with state energy code requirements.
Local Electric Utility: Huntsville Utilities
Building Department: City of Huntsville Building Department
Local Trade Association: ACCA Alabama Chapter / ASHRAE Tennessee Valley Chapter