The first zone listed below the HVAC system in the building tree represents the control zone when dealing with single zone systems. This zone will have a thermostat that will control the HVAC operation and cannot be input as an unconditioned zone.
In the building tree, at the System level of the tree, click and hold on a zone and you can then drag and drop that zone so that it is the first zone directly below the System icon.
Another option is you can edit the Zone and change the Zone Type to Conditioned.
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