energy recovered from air exhausted outside of said vehicle through the ventilation passage thereby the air conditioner increases the heating and cooling ability and reduces the energy necessary for maintaining a constant temperature in the passenger compartment application_number US 62637896 A description with respect to fig2 an air conditioner for a heat pump type refrigerant circuit is depicted in accordance with a first embodiment the same numerals are used in fig2 to denote corresponding elements depicted in fig1 thus a further detailed explanation of those elements is here omitted in the embodiment of fig2 air conditioner 200 includes a first heat exchanger 15 positioned in parallel to external heat exchanger 3 in a refrigerant circuit first heat exchanger 15 includes refrigerant passageway 15a exchanging heat with the refrigerant and heat medium passageway 15b for exchanging heat with the working fluid solenoid valve 16 may be provided in the refrigerant circuit for closing and opening the path of the refrigerant into refrigerant passageway 15a of first heat exchanger 15 which is disposed in ventilation duct 14 for recovering the energy e g the calories expended to heat or cool the vented air which air is exhausted to the outside of the vehicle through ventilation duct 14.