Patent ID: 7165416

Claim:
An air conditioner comprising: a case having an air inlet passage therein for directing external air into a room, an air outlet passage therein, intersecting the air inlet passage, for directing a room air to an exterior; a regenerative heat exchanger at a intersecting point of the air inlet and outlet passages for making indirect heat exchange of the external air and room air flowing through the air inlet and outlet passages, respectively; first and second heat exchangers provided on the air inlet and outlet passages, respectively, for exchanging heat with an air passing through the air inlet and outlet passages, respectively; a first air inlet making the air outlet passage and the room be in communication; a second air inlet making the air inlet passage and the exterior be in communication; a first air outlet making the air inlet passage and the room be in communication; a second air outlet making the air outlet passage and the exterior be in communication; a third air inlet making the air inlet passage and the room be in communication; and a flow passage opening and closing device in the case for selective opening and closing of the third air inlet and the air inlet passage.