San Jose Climate Zone & Energy Code

Climate Zone: CEC Climate Zone 4 (inland Bay Area, mixed). IECC Climate Zone 3C. San Jose's inland position produces warmer summers than coastal SF — 97°F cooling design vs. 73°F on the SF coast — while maintaining mild winters.

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 San Jose and all Santa Clara County jurisdictions enforce Title 24. The 2025 code's expanded heat pump provisions and updated efficiency tiers are particularly relevant in the Bay Area, where all-electric new construction is increasingly required.

Local Electric Utility: Pacific Gas & Electric (PG&E)

Building Department: City of San Jose Dept. of Planning, Building & Code Enforcement

Local Trade Association: ACCA California / ASHRAE Silicon Valley Chapter / CABEC