Alexandria Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 4A (mixed-humid). Alexandria's DC metro position produces hot, humid summers (93°F/74°F cooling design) and cold winters (18°F heating design). Historic Old Town housing stock requires careful actual-envelope Manual J analysis.

Energy Code & Manual J Requirement: Virginia Energy Code (IECC 2021). ACCA Manual J required for residential HVAC permits in the City of Alexandria and all local jurisdictions.

Local Electric Utility: Dominion Energy Virginia (Dominion Power)

Building Department: City of Alexandria Building & Fire Code Administration

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