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You can attach multiple HVAC equipment (whether zonal equipment, airloop HVAC, etc.) to the ZoneHVAC:EquipmentList object. This object defines all HVAC equipment serving the zone.

To specify the operation, you could then:

• Set the load distribution scheme to "SequentialLoad"
• Define Sequential Heating/Cooling Fraction Schedules, so that one system has 1s between 7:00-16:00 and 0s elsewhere, and the other system has 1s between 16:00-7:00 and 0s elsewhere.

(Alternatively, you could probably set the Sequential Heating/Cooling Fraction Schedules to constant 1s, and then use availability schedules on the equipment themselves to define their operation.)