Hey @charlie.brooker ,
You can limit the heating/cooling capacity of an ideal air system with the HB Ideal Air component but trying to implement something similar for all of the detailed HVAC template systems is difficult since it’s not always clear which piece of HVAC equipment should be limited in size in order to restrict the heating/cooling capacity (eg. Boiler, heating coil, zone equipment, air loop for all-air systems).
Grated, if you use IronBug to assign your HVAC system, you can limit the size of whatever equipment you want. So this would be my suggestion of you need to customize the heating/cooling capacity of a detailed system.