Hi, ScheduleRoomTempControl can schedule your vents opening and closing and control the vents based on the cooling/heating setpoints.
For more details, refer to the ST community wiki:
http://thingsthataresmart.wiki/index.php?title=ScheduleRoomTempControl
There is also ecobeeSetZoneWithSchedule with even more features depending on your use cases (check out the configuration section) :
http://thingsthataresmart.wiki/index.php?title=EcobeeSetZoneWithSchedule
This last smartapp has been designed specifically for the ecobee thermostats (it requires My ecobee DTH) which is the most advanced ST-ecobee Integration and the smartest thermostat under ST:
Regards