Harrisburg Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 4A (mixed-humid). Harrisburg's Susquehanna Valley position produces hot, humid summers (92°F/74°F cooling design) and cold winters (6°F heating design). Four-season HVAC design is required for both significant heating and cooling loads.

Energy Code & Manual J Requirement: Pennsylvania Energy Code (IECC 2021). ACCA Manual J required for residential HVAC permits in Dauphin County and Harrisburg area jurisdictions.

Local Electric Utility: PPL Electric Utilities

Building Department: City of Harrisburg Building Division

Local Trade Association: ACCA Pennsylvania / ASHRAE Pennsylvania Chapter