Practical guidance on HERS testing, Title 24 compliance, energy efficiency, and building better-performing homes.
There are two scenarios where Raters are required to verify the register boots have been sealed to the surrounding material. When register boot sealing is mandatory Bottom LineNew duct system: register boots…
An HVAC system can only deliver the airflow its ductwork and grilles allow. Even a correctly sized air conditioner or heat pump may perform poorly when the return duct is too small,…
For California residential projects permitted under the 2025 Energy Code—generally permits applied for on or after January 1, 2026—the HVAC duct-insulation requirement depends on duct location and the compliance method. Duct location/system…
Key Tips of a Successful HERS Rating (New Construction) under Code Cycle 2025
The California Energy Commission identifies inadequate air barriers, insulation gaps, compression, and lack of contact with the air barrier as common problems that reduce thermal performance. QII uses independent field verification to…
HVAC Duct Sealing Best Practices for Title 24 Compliance Proper HVAC duct sealing reduces conditioned-air loss, improves comfort and helps an installation satisfy California Title 24 requirements. The photographs below show recommended…
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