I have got this custom / average temperature value working on the DEVELOPER section of another instance of Home Assistant, but still don’t know how to turn it into a working YAML.
- platform: template
Sensors:
averageGF_T:
friendly_name: ‘Ground Floor Temp’
unit_of_measurement: ‘°C’
value_template: {{((states(‘sensor.lounge_valve_current_temperature’)|float+states(‘sensor.dining_room_th01_temperature’)|float+states(‘sensor.living_room_th01_temperature’)|float+states(‘sensor.receiver_current_temperature’)|float)/4.0)|round(2)}}