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Make Temperature Offset only apply when radiator is on

At the moment the temperature offset on TRVs is linear so it always applies +/- X degrees. This is an issue because sometimes the offset causes the temperature reading to be far too low thereby causing a call for heat unnecessarily

In reality the offset is not linear in the vast majority of cases. If the radiator is off you're getting room temperature readings and when the radiator is on you're getting a reading that's too high.

I suggest switching the offset so it only applies when the radiator is on which you would know because your TRV in a room would be activated. Ideally you would scale the offset depending on the amount of time the radiator has been on or depending on the amount of temperature the trv was reading above room temperature when the offset was set.
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