Irvine Climate Zone & Energy Code

Climate Zone: CEC Climate Zone 8 (transitional inland OC) for Irvine; CEC Zone 7 (coastal) for Newport Beach/Laguna. IECC Climate Zone 3C. Orange County's climate gradient from cool coastal to warm inland covers multiple CEC zones — project-specific location determines the design conditions.

Energy Code & Manual J Requirement: California Title 24 Part 6 (2025 edition, effective January 1, 2026). ACCA Manual J required for residential HVAC sizing. All Orange County jurisdictions enforce Title 24. Many Orange County cities are adopting or have adopted reach codes requiring all-electric or heat-pump-first construction.

Local Electric Utility: Southern California Edison (SCE)

Building Department: City of Irvine Community Development Department

Local Trade Association: ACCA California / ASHRAE Orange County Chapter