This is a process that involves special tools to do. This would be best left to a professional. Refrigerant has to be pumped back into condenser or recovered. Line set, and electrical need to be...
this is a common problem.. this means that the air surrounding the unit is hotter that the air that is going through the unit.. try insulating the parts that are sweating..
3 basic components .
Typically needs "A" coil atop furnace in ductwork, large vapor and small liquid copper lines running between a-coil and external (outside) condensor/compressor unit, 220 V...