There are major components in an air conditioner. They are;  the Evaporator which receives liquid refrigerant, a Condenser that facilitates heat transfer, Expansion Valve that regulates refrigerant flow into the evaporator and a Compressor which pumps that pressurizes refrigerant.  These parts manage refrigerant and move air indoors and outside. If you are in need of air conditioner repair it may be because of one of these parts.