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Hi Andy. I've noticed whenever anyone asks about offset, the text in Volker's reply to you is pasted. Sometimes though I think the point is being missed - there is a nice blog post that explains in more detail how the target temperature is achieved and there is a "well proven" (I take that to mean "complicated") algorithm to deal with all of the factors the system has to deal with. I think your answer is close to the real answer in that there is a kind of "momentum" when heating or cooling and if you react too simplistically there will be big swings in temperature, where the system keeps over shooting the target temperature. I'm new to the Thermo, so I'm hoping that if I can be patient and not keep changing the settings, it will stabilise.