Do all AC pipes sweat? What I mean is the outside pipes connecting to the condenser. I've noticed that I have one pipe that is connected to a close (~10 ft) unit that is very cold and sweats quite a bit. The other pipe on the 2nd unit that is the furthest from the blower/evaporater (~60 ft) is not very cold and doesn't sweat at all.

Does this mean that the non-sweating pipes may not have sufficient coolant in them? Or is it typical for this kind of arrangement?