Enter the ZIP code
Use the five-digit ZIP code for the project location.
California Title 24 resource
Find your HVAC duct R-value.
Enter the project ZIP code to identify its California climate zone and corresponding 2022 Title 24 duct-insulation value.
Fast ZIP lookup
California climate-zone data
No personal data collected
2022 T24 lookup
Duct insulation requirement
How it works
A clearer path to compliance.
This quick reference helps project teams identify the duct-insulation requirement associated with a California climate zone.
Confirm the climate zone
The tool securely checks the local ZIP-to-climate-zone dataset.
Review the R-value
Use the result as a quick reference when planning your project.
Planning note
This tool is a convenient reference, not a substitute for approved plans, current code documents, or direction from the authority having jurisdiction.
