Concord Climate Zone & Energy Code

Climate Zone: CEC Climate Zone 12 (inland East Bay / Diablo Valley). IECC Climate Zone 3B. Concord's inland position means significantly warmer summers than coastal Bay Area communities — 97°F cooling design versus Oakland's 78°F — while winters remain mild (28°F heating design).

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 Concord and Contra Costa County jurisdictions enforce Title 24. Many Contra Costa County cities are adopting electrification reach codes.

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

Building Department: City of Concord Community & Economic Development

Local Trade Association: ACCA California / ASHRAE East Bay Chapter