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How large is the switching differential (hysteresis) of the FRITZ!DECT smart plug?

The switching differential (hysteresis) of smart plugs, for example FRITZ!DECT 200, is 1 Kelvin when heating and 2 Kelvin when cooling. This means, for example, that if you set the desired temperature to 20 °C, the smart plug switches on at 19 °C and switches off at 21 °C. The value for the switching differential is fixed and cannot be changed.