Fresno Climate Zone & Energy Code
Climate Zone: CEC Climate Zone 13 (hot Central Valley). IECC Climate Zone 3B (hot-dry). Fresno's climate is characterized by extreme summer heat (103°F design), low humidity, and mild winters. Sensible cooling loads dominate; latent loads are relatively low due to the dry climate.
Energy Code & Manual J Requirement: California Title 24 Part 6 (2025 edition, effective January 1, 2026). ACCA Manual J required for residential HVAC sizing. City of Fresno and Fresno County enforce Title 24. The 2025 code's updated efficiency minimums (SEER2, EER2) and heat pump provisions affect equipment selection in Fresno's climate.
Local Electric Utility: Pacific Gas & Electric (PG&E)
Building Department: City of Fresno Development & Resource Management Department
Local Trade Association: ACCA California / ASHRAE San Joaquin Valley Chapter