Hi @bartkummel
I can answer some of your questions with my experience from last winter. I have a number of Hive TRV’s, (basically re-badged Danfoss Ally TRV’s) and Aqara E1 TRV’s. I control them separately using the schedler-component and scheduler-card. Each room has it’s own external temperature sensor which I find more acurate than using the TRV’s internal temperature sensors. Mine are TuYa WSD500A temperature and humidity sensors, they are cheap and work very well. To link the external temperature sensors to the Aqara TRV’s I use this blueprint z2m_aqara_trv_external_temperature.yaml · GitHub , and for the Hive TRV’s I use this blueprint ZHA, Zigbee2MQTT - Danfoss Ally send external temperature to TRV . I control the temperature of each room with the generic thermostat. All of the hardware is Zigbee which has proven to be 100% reliable so far.
I find the Danfoss Ally (Hive) TRV’s to be both more accurate and quieter than the Aqara’s, I will be fitting several more of these before the winter.