WTH can't remove area of an entity

I have a airco in the living room that reports a temperature too high ( I compared with 3 different sensors from different brands, this airco reports at least 3C higher than the others).

When I uncheck the “Use device area (Living Room)” option in the sensor.living_room_airco_indoor entity and save it, it does not change: opening the entity shows as still in the living room.

Combine this to the fact that we cannot select what devices are taken into account for the average in the area cards means that my living room shows up as being a sauna compared to the rest of the house :rofl:

Have you tried hiding the temp sensor in the settings for the entity? If it’s not a part of a larger entity?

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AFAIK, the area card takes all “device_class=temperature” (and not diagnostic) entities belonging to this area, then calculates an average value.
Are you saying that this entity does not have an “area” set?
Is it present in “area_entities()” template’s output?