1. A method for air-conditioning a cold aisle that is at least partially delimited by rows of racks containing heat-generating devices, comprising:arranging the cold aisle in a hot room having a floor, the hot room being separated from an adjacent room by a single boundary wall extending perpendicular to the floor, the single boundary wall delineating the hot room from the adjacent room;
arranging a heat exchanger in the single boundary wall, so that a region of the single boundary wall is a cooling wall;
disposing a fan in an opening in the single boundary wall adjacent to the heat exchanger, so that an exhaust side of the fan is connected to the cold aisle;
conveying air through the opening and into the cold aisle using the fan;
wherein the opening is arranged on a longitudinal axis of the cold aisle;
and wherein the cold aisle is connected to the single boundary wall in such a way that the opening is surrounded by the cold aisle.