You need to check with the manufacturer of the refrigeration unit in question. On many refrigeration (not air conditioning) systems the hot high pressure liquid line going to the evaporator is mechanically attached to the cool suction line which travels back to the compressor in what is called a desuperheater. This allows the suction line to cool down the liquid and eliminate vapor bubbles in this liquid. This also warms up the suction line and helps eliminate excess sweating. It is still necessary to insulate the lines thoroughly, sealing ends and openings. Hope this helps.