All three brands are good. If you have to rank them, you must first look at the performance of each brand!
compressor
Daikin domestic compressor, Gree OEM.
Mitsubishi electric: The main parts are imported! Won a number of energy-saving awards!
Hitachi: The domestic Hitachi central air conditioner is produced by Qingdao Hisense Hitachi Air System Co., Ltd., whose full name is Hisense Hitachi central air conditioner! Hisense used to cooperate with Hitachi, but now it only uses Hitachi trademark.
Comfort level
Refrigeration is the basic skill of air conditioning, and heating is a test of the strength of central air conditioning!
Daikin heating is not good, mitsubishi electric is the best, and Hitachi is ok.
pipeline
Daikin and Hitachi adopt welding, and mitsubishi electric adopts whole pipe connection (to reduce leakage).
Compressor unit capacity
Daikin 6HP, Hitachi 6HP, mitsubishi electric 18HP.
Refrigerant technology
Daikin: High-performance cooling circuit, Hitachi uses a simple stainless steel heat exchanger as a subcooler, which cannot be accurately controlled!
Mitsubishi electric: Industry first! Unique HIC circuit! !