Common questions about Title 24 in Climate Zone 15. Remember: Title 24 is statewide — the zone calibrates the energy budget, and your exact zone comes from your project address.
About Climate Zone 15 and Title 24
Title 24 is a statewide California energy code. Climate Zone 15 does not have its own separate rules — the same statewide standards apply, with the energy budget calibrated to this zone's climate. Your project's exact requirements are determined when your specific address is modeled in CEC-approved compliance software. Below are the questions we hear most often. For the full picture, see the Climate Zone 15 overview and the complete Title 24 guide.