How large a SEER condenser will 120' of 5'16" verticle copper tubing on a split system (condo-live on 1st of 12 floors) effectively handle? I don't have the option to change to 3/8" line. I currently have a 2 ton Trane 11Seer and want to upgrade to a 2 1/2 ton Trane, ideally 16 SEER.
