New Ecobee lite Thermostat - much cheaper-

@Barkis,

  • If you look at My ecobee V5 thread, I have a smartapp called MonitorAndSetEcobeeHumidity that uses
    a target humidity level to trigger your humidifier/dehumidifier/HRV/ERV connected to ecobee.
  • Otherwise, if you want to implement some custom rule, you may want to look into Core. My Ecobee device exposes all thermostat capabilities for Core processing.

Regards.