Temecula Climate Zone & Energy Code

Climate Zone: CEC Climate Zone 10 (south Riverside County / Temecula Valley). IECC Climate Zone 3B. Temecula's elevation (~1,000') slightly moderates summer heat compared to the lower Inland Empire — 99°F cooling design and 30°F heating design — but the valley still experiences demanding summer cooling requirements.

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 Temecula and Riverside County jurisdictions enforce Title 24.

Local Electric Utility: Southern California Edison (SCE)

Building Department: City of Temecula Building & Safety Division

Local Trade Association: ACCA California