Air conditioner

A combination comprising:

• a building having a plurality of stories, each of which has a floor and a ceiling spaced from the floor of a next upper story, the floor being provided with first and second penetrating heating ventilation openings, and the ceiling being provided with first and second penetrating cooling ventilation openings;
• and
• an air conditioner which comprises:
• a housing built in the space defined between the ceiling of a first lower story and the floor of a second upper story above said first story, the housing being provided with a first suction port communicating with the upper story through the first heating ventilation opening, a first ejection port communicating with the upper story through the second heating ventilation opening a second suction port communicating with the lower story through the first cooling ventilation opening, and a second ejection port communicating with the lower story through the second cooling ventilation opening;
• a refrigeration cycle system provided with a condensation heat exchanger and an evaporation heat exchanger which are built in the housing;
• a first blower, which is built near the condensation heat exchanger in the housing, for conducting the air of the upper story into the housing through the first suction port, and drawing off the air passing through the condensation heat exchanger into the upper story through the first ejection port;
• a second blower, installed near said evaporation heat exchanger in the housing, for conducting the air of the lower story into the housing through the second suction port, and drawing off the air passing through the evaporation heat exchanger into the lower story through the second ejection port;
• and
• valve means fitted the the first suction and ejection ports and second suction and ejection ports to selectively open the ports.