A cooler for cooling a gaseous medium includes: a housing; a heat exchanger in the housing, the heat exchanger having an inlet portion at a flow inlet side of the heat exchanger, an outlet portion arranged at a flow outlet side of the heat exchanger, and tubes through which a coolant flows and about which gaseous medium to be cooled circulates; at least one inflow, through which the medium to be cooled can be introduced into the housing and fed to the inlet portion of the heat exchanger; at least one drain, through which cooled medium originating from the outlet portion of the heat exchanger can be discharged out of the housing; and at least one perforated plate-like flow homogenization element positioned in the housing at a position upstream of the inlet portion of the heat exchanger, seen in a flow direction of the medium to be cooled.