Allentown Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 5A (cold-humid). Allentown's Lehigh Valley location produces cold winters (9°F heating design) and hot, humid summers (91°F/73°F cooling design). Fast-growing market driven by logistics and metro spillover.

Energy Code & Manual J Requirement: Pennsylvania Uniform Construction Code (IECC 2021). ACCA Manual J required for all Lehigh and Northampton County HVAC permit applications.

Local Electric Utility: PPL Electric Utilities

Building Department: City of Allentown Department of Development & Planning

Local Trade Association: ACCA Pennsylvania / ASHRAE Pennsylvania Chapter