Hi @jbrukardt ,
With My Ecobee device, you can use the ecobeeSetZoneWithSchedule smartapp which is based on the concepts of rooms/zones/schedules.
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The schedules in the smartapp are linked to the ecobee comfort settings (scheduled programs at ecobee such as Home, Away, Sleep, Awake or any custom ones), so that the ecobee scheduling is driving the execution of the schedules in the smartapp (as the ecobee scheduling is more reliable than the ST scheduling).
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In ecobeeSetZoneWithSchedule, you can specify the max temp differential allowed between all your scheduled zones/rooms in order to turn on your HVAC fan or any other fan switches in your home.
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The max temp differential can be customized on a schedule basis, so that you could have a different temp differential threshold during the day vs. at night.
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The smartapp has many other features such as the option to use any ST connected temp/motion sensors to adjust the thermostat’s setpoints (not only the proprietary ecobee sensors) and reproduce the follow me & smart away features. For instance, you could use the Xiaomi temp/motion sensors that can sell for as low as $10 as a room sensor.
For more information about ecobeeSetZoneWithSchedule, refer to the supported features & configuration sections at the ST community wiki:
http://thingsthataresmart.wiki/index.php?title=EcobeeSetZoneWithSchedule#Supported_Features
For more information about My Ecobee device, refer to
http://thingsthataresmart.wiki/index.php?title=My_Ecobee_Device
My zoned heating/cooling solutons have been used by many ST users and the related thread is here:
P.S. The best bundle for your use case would then be My Ecobee bundle at my store.
Regards.