A glass surface with intuitive touch control buttons and display combine design, feel and functionality in an outstanding way. The internal controller of the JOY calculates control values for heating/cooling applications, which are provided via analog or digital outputs (depending on type). The possible integration of various external sensors (e.g. window contacts, change-over, condensation sensors, etc.) allows temperature control tailored to the application. The device can be mounted in a standard flush-mounted box.