Baltimore Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 4A (mixed-humid). Baltimore's Chesapeake Bay watershed location produces hot, humid summers (91°F/74°F cooling design) and cold winters (14°F heating design) with the bay's moderating influence.

Energy Code & Manual J Requirement: Maryland Building Performance Standards (IECC 2021). ACCA Manual J required for residential HVAC permits. Baltimore City and Baltimore County administer permits separately, both under Maryland's state energy code.

Local Electric Utility: BGE (Baltimore Gas & Electric / Exelon)

Building Department: City of Baltimore Department of Housing & Community Development

Local Trade Association: ACCA Mid-Atlantic Chapter / ASHRAE Chesapeake Chapter / SMACNA Mid-Atlantic