Arlington Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 4A (mixed-humid). Arlington's DC metro position produces hot, humid summers (93°F/74°F cooling design) and cold winters (17°F heating design). The urban heat island effect in this dense urban county adds several degrees to actual design conditions.

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

Local Electric Utility: Dominion Energy Virginia (Dominion Power)

Building Department: Arlington County Building Division

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