Official California state documents, tools, and links to help contractors and homeowners stay informed and compliant.
We have dedicated pages for contractors and homeowners with content tailored to each audience.
Leakage rates, airflow requirements, climate zone R-values, exemptions, city requirements, and a printable checklist for every job.
Go to Contractors Page →When permits are required, what's at risk without one, questions to ask your contractor, and how to verify a contractor license.
Go to Homeowners Page →These are official government and state agency documents and tools we reference and recommend for contractors and homeowners.
Official California state guide explaining permit requirements and homeowner rights for HVAC installations. Recommended reading for both contractors and homeowners.
PDF — CSLB.ca.govCheck if your HVAC contractor is currently licensed and in good standing with the California Contractors State License Board. Always verify before hiring.
CSLB.ca.govOfficial California Energy Commission page for Title 24 Building Energy Efficiency Standards — the state law that governs HVAC installations.
Energy.ca.govReady to schedule a Title 24 inspection or permit processing? Submit your job details online and we'll follow up within one business day.
TopNotchECS.comCall the California Contractors State License Board directly to verify a contractor license or report unlicensed contractor activity.
(800) 321-2752A written construction permit is required prior to the installation, relocation, or alteration of any mechanical system in California.
California Mechanical Code