An internal device arrangement for a passenger cabin, for example of an aircraft, is provided. The device has an internal device element which is selected from a group including wall paneling, window panel, side panel, ceiling paneling and luggage compartment. The device has an electrical apparatus fitted in or on the internal device element; and at least one line for supplying power to the electrical apparatus. Furthermore, a heat dissipation device in the form of an integral component part of the internal device element, the electrical apparatus and/or the at least one line is provided. Such a heat dissipation device makes it possible to dispense with an additional heat sink for temperature management and thus save installation space and weight.