Pasadena Climate Zone & Energy Code

Climate Zone: CEC Climate Zone 9 (inland San Gabriel Valley / LA foothills). IECC Climate Zone 3B. Pasadena's foothill position produces hot summer conditions — 98°F cooling design — amplified by Santa Ana wind events. The 32°F heating design reflects the moderate winter climate typical of the greater LA area.

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 Pasadena and LA County jurisdictions enforce Title 24. The City of Pasadena has adopted aggressive climate action goals including electrification requirements.

Local Electric Utility: Pasadena Water & Power (PWP)

Building Department: City of Pasadena Department of Planning & Community Development

Local Trade Association: ACCA California / ASHRAE Los Angeles Chapter