I not sure if we are talking about the same thing now, this was about Setpoints?
I had to look at what I did on the VL which is still humming away doing what it was designed for.
The reality is that Temp changes are detected by the Temp Sensor in the Thermostat.
The below is in UI5, not all triggers,conditions and actions can be shown, this was a limitation of this version of PLEG.
The temp changes are used in conditions with other triggers, properties & schedules.
Actions set the Setpoint(s), in my case I have different Setpoints for times of Days or Days.
In short Setpoints are just that…a point that has been set and in the case of Thermostats, it is the Thermostat that maintains the Temp, not the HA System.
The above illustrates how you can get a value from your thermostat in PLEG (really simple as it in the drop down), select what temp you want then use this trigger in your Conditions to do whatever you want to do.
Hope that this answers all the queries?