Louisville Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 4A (mixed-humid). Louisville's Ohio River valley location produces hot, humid summers (93°F/75°F cooling design) and meaningful winter cold (10°F heating design). River valley topography can amplify both summer heat and cold front effects.

Energy Code & Manual J Requirement: Kentucky Residential Building Code (IECC 2009). ACCA Manual J required for Louisville Metro and all Jefferson County HVAC permits.

Local Electric Utility: Louisville Gas & Electric (LG&E / LG&E KU Energy)

Building Department: Louisville Metro Government Code Enforcement – Building Inspection

Local Trade Association: PHCC Kentucky / ASHRAE Kentucky Chapter / SMACNA Kentucky