low efficiency in the other part of the condenser 80 contacting with the space of the machine room 104 in the side of the cooling fan 60 however according to this embodiment as set forth above the condenser 80 has a panel shaped configuration which is wide in heat radiating area and exposed out of the machine room 104 resultantly maintaining high heat exchange efficiency compared to the conventional tube type condenser 30 refer to fig1 the air dam 62 is not an essential component for implementing the invention and the invention can provide another embodiment with a configuration where the air dam 62 is excluded referring to fig5 the another embodiment of the invention comprises main components such as a compressor 20 biased to one side in a machine room 104 a cooling fan 60 placed in a substantially central position of the machine room 104 at a certain distance from the compressor 20 for blowing cool air away from the compressor 20 and a condenser 80 covering the rear portion of the machine room 104 in the meantime the compressor 80 has the same configuration and structure as the condenser described in reference to fig3 and 4 however according to features of this embodiment the cooling fan 60 is installed substantially in the center of the machine room 104 and also blows the air in a direction opposite to the installed position of the compressor 20 similar to the first embodiment of the invention the machine room 104 is closed in all sides except for the condenser 80 so that the air flow between the inner and outer space of the machine room can be carried out only through the condenser 80 describing the internal operation within the machine room 104.