A system and method for cooling a room configured to house a plurality of
computer systems. A heat exchanger unit is configured to receive air from
the room and to deliver air to the room. The heat exchanger unit is
supplied with cooling fluid operable to cool the received air in the heat
exchanger unit. At least one of the temperature of the cooling fluid
supplied to the heat exchanger unit and the air delivery to the room may
be controlled in response to temperatures sensed at one or more locations
in the room.