A machine for processing liquid or semi-liquid food products comprises: a containing element for containing the product to be dispensed; a stirrer for stirring the product to be dispensed; a heat exchanger fluid flowing in a circuit in a direction of circulation through an evaporator, a compressor, a condenser and a pressure reducing element; a fan rotating about an axis of rotation to force an air flow towards the condenser; a control unit connected to the fan to control the fan through a speed signal; a temperature sensor, located downstream of the condenser in the circulation direction to detect a condensation temperature and configured to send to the control unit a temperature signal as a function of which the control unit generates the speed signal.