A kapott, hibás template minta :

sensor:
- platform: template
name: "Heatpump_COP"
unit_of_measurement: "COP"
lambda: |-
return ((id(${devicename}_power_output).state) / ((id(${devicename}_electricity_consumption).state);
accuracy_decimals: 4
update_interval: 15s

- Ebből (⇑), a hibás rész javítása :
( (id(${devicename}_power_output).state / id(${devicename}_electricity_consumption).state ) );

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