[HayZee518]

both condensers are mounted outside - correct? if the tech added freon to both or either unit there is a leak somewhere because the freon system is a closed circuit. unless there is a leak, there is no way the freon could get low. it doesn't break down from use, it doesn't change state from one week to another. lines to the evaporator should be one continuous length. lines from the evaporator should be one continuous length. lines that are spliced should be brazed, and not be relied upon using flare connectors. the way they are brazed is one tubing is expanded so the other tubing fits into the expanded end and they are silver brazed together. the high pressure line and suction line are routed "together" back to the compressor/condenser unit. the suction line [the bigger line] is insulated along its entire length using neoprene foam tubing. the boiling point of freon - either r-12 or r-22 is around minus 28 degrees so exposed copper lines will freeze forming ice but will not effect the freon inside. your tech might need to check all splices with an infrared leak tester or a propane tank reaction plate tester. not many techs want to take the time to check splices, but they have to if they are make good a service call.