Alpharetta Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 3A (mixed-humid). Alpharetta's north Atlanta position at slightly higher elevation produces the Atlanta metro's mildest conditions — 19°F heating design and 91°F/73°F cooling design. Both cooling and heating require proper sizing for year-round comfort.

Energy Code & Manual J Requirement: Georgia Energy Code (IECC 2015). ACCA Manual J required for residential HVAC permits in Fulton County and Alpharetta jurisdictions.

Local Electric Utility: Georgia Power (Southern Company)

Building Department: City of Alpharetta Community Development Department

Local Trade Association: ACCA Georgia Chapter / ASHRAE Georgia Chapter