I’m kind of new to Home Assistant so bear with me (just installed this week).
I’m trying to do something extremely simple which somehow becomes extremely complicated in a system as complex as Home Assistant 
I just want to be able to control the target temperature of the radiator depending on a schedule, e.g. set 21 degrees between 17 and 20 every day, otherwise set 14 degrees.
In order to do that I created a schedule (using the schedule integration) and then tried to define a new automation which has as trigger " When Schedule changes from off to on". In this automation, however, I cannot seem to select the action to change the value of the target temperature: I can only act on HVAC and preset mode.
Is this intended behaviour or am I just hitting a limitation of the UI configuration?
I can indeed change the target temperature manually acting in the UI (either from a thermostat card or from the device infos), so I’m wondering why this value is not exposed as action for a trigger…