Lancaster Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 4A (mixed-humid). Lancaster's position produces hot, humid summers (91°F/74°F cooling design) and cold winters (9°F heating design). The county's generally more moderate position in Pennsylvania's Piedmont produces slightly milder winters than central PA.

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

Local Electric Utility: PPL Electric Utilities

Building Department: City of Lancaster Bureau of Building Inspection

Local Trade Association: ACCA Pennsylvania