California is divided into 16 climate zones for Title 24 energy compliance purposes. Your climate zone is determined by your exact project address and has a significant impact on what your report requires and which energy efficiency measures will bring your project into compliance.
How climate zones affect your report
Different zones have different baseline energy budgets. Areas with hotter summers typically face stricter cooling requirements, while coastal regions with mild year-round temperatures have more moderate thresholds. The compliance path for a project in a hot inland zone will look different from a project near the coast — particularly around window performance and HVAC system selection.
We serve all 16 California climate zones
You do not need to look up your climate zone yourself. We determine it from your project address when we begin modeling your report. Our energy analysts are familiar with building department expectations and common compliance paths across all California regions.
Note on city-to-zone mapping
Climate zones vary by exact project location, not just city. A single city or county may span multiple climate zones depending on elevation, proximity to the coast, and local geography. When in doubt, we look up the exact address — not the city name.