Whether you are installing Mitsubishi, Fujitsu or Daikin, the most important thing with the ductless mini split air conditioners is how the copper flare to connect the unit is made. This equipment does not use solder joints. After it is connected the system needs to be pressurized with nitrogen with at least 500 psi to make sure there is no leakage. Over 90 % of the problems with these systems are due to incorrect installation. We use Daikin mini splits because of the manufacture’s warrant and the replacement part accessibility.