@zosobao, the following smartapp has some capabilities built-in. You can specify a max temp adjustment within a schedule and if the temp differential between all your indoor sensors is too big, then the fan mode settings will be overridden with the fan mode settings associated to the schedule. Otherwise, the default fan settings associated to your ecobee program/climate (ex. Home, Away, Awake, Sleep) will be set.
This smartapp has been designed for ecobee users, and can override ecobee’s program (heating/cooling setpoints, fan settings) based on some indoor/outdoor conditions. It also shares the same foundation & features as this generic one:
Please support the developer!
Regards