Abstract: A device having a heat exchanger, wherein the heat exchanger has pipes which carry a cooling medium, wherein the heat exchanger has a fin arrangement which is penetrated by the pipes, and wherein the heat exchanger has a heating device integrated in the heat exchanger, with a control device for controlling the heating device, wherein the heating device has two or more separately controllable heating sections, wherein each heating section is assigned a defrosting area of the heat exchanger, and wherein the heating device is set up for the separate defrosting of individual defrosting areas of the heat exchanger by the separately controllable heating sections.

Abstract: An air cooler for cooling air in rooms, such as walk-in storage or cooling rooms includes: a housing, with a bottom, a cover, which can be fastened directly and without spacing to a ceiling of the room to be cooled, and at least one side wall, in which at least one air outlet is arranged; at least one planar heat exchanger, arranged in the housing and laying substantially horizontal; and at least one fan arranged in the housing for sucking in air from the room to be cooled. The air sucked in flows through the planar heat exchanger at least substantially in the vertical direction and is deflected by the fan in the horizontal direction to the air outlet. The fan and the air outlet are arranged above the heat exchanger in the air cooler to avoid dripping of condensed water and accumulation of dust and dirt.