Abstract: A conditioning system of the free cooling type for environments and particularly for computing centers, which comprises: a conditioning unit of the free cooling type, which in turn comprises an air/air heat exchanger, inside which two air flows exchange heat, a primary air flow, from and toward an environment to be air-conditioned, and a secondary air flow, or process flow, drawn from outside, and evaporative cooling elements using water, first fans for moving the primary air flow, second fans for moving the secondary air flow, detectors for detecting temperature and humidity for the primary air flow and the secondary air flow at the inlet and at the outlet of the conditioning unit, detectors for detecting the flow-rate of the primary air flow and of the secondary air flow, an electronic control and management unit adapted to collect and process the data detected by the detectors and adapted to determine, on the basis of the outside humidity and temperature values and of the demand for cooling, the operati