Corona Climate Zone & Energy Code

Climate Zone: CEC Climate Zone 10 (west Riverside County / western Inland Empire). IECC Climate Zone 3B. Corona's position between the Santa Ana Mountains and the Inland Empire produces hot summer conditions — 101°F cooling design — tempered by occasional marine influence through mountain passes. Heating design 31°F.

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 Corona and Riverside County jurisdictions enforce Title 24.

Local Electric Utility: Southern California Edison (SCE)

Building Department: City of Corona Building & Safety Division

Local Trade Association: ACCA California