{HEAD ~ A device} 1, inclduing {TAIL ~ sensor} means for sensing a difference between the air temperature in the room and air temperature outside the room, and for starting operation of the fan means and the cooling circuit when said difference amounts to a predetermined lower value and to stop operation of the fan means and the cooling circuit when said difference amounts to a predetermined higher value 
inclduing
{ HEAD ~ A device } 1 , inclduing { TAIL ~ sensor } means for sensing a difference between the air temperature in the room and air temperature outside the room , and for starting operation of the fan means and the cooling circuit when said difference amounts to a predetermined lower value and to stop operation of the fan means and the cooling circuit when said difference amounts to a predetermined higher value
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