thanks for the additional info @chris…one thing I did notice when testing the “-1” option is if you run an HBzone that is associated with a “thermostat only” HVAC system, the “Honeybee_separateConditionedUnconditioned” component does not recognize the zone as Unconditioned…i’m sure this component is more reading the output of Mass2Zone _isConditioned, but just thought I would mention.