The future of bypass ducts in zoned California heating and cooling systems appears very bleak.
The California Energy Commission (CEC) recently proposed a code change that would prohibit the use of bypass ducts in zoned heating and cooling systems, and eliminate existing Title 24 zonal performance compliance credits. The proposed legislation would also establish a minimum system output of 350 cfm/ton and a maximum watt draw of 0.58 W/cfm.