Knoxville Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 4A (mixed-humid). Knoxville's Great Appalachian Valley location produces hot, humid summers (93°F/75°F cooling design) and genuine winters (19°F heating design). Valley location with Appalachian terrain nearby.

Energy Code & Manual J Requirement: Tennessee Residential Building Code (IECC 2021). ACCA Manual J required for all Knox County and East Tennessee HVAC permit applications.

Local Electric Utility: KUB (Knoxville Utilities Board, TVA distributor)

Building Department: City of Knoxville Building & Code Enforcement Division

Local Trade Association: ACCA Tennessee / ASHRAE Tennessee Valley Chapter