Features: 1) One to one (one outdoor machine to one indoor machine) system, or one to more system 2) The indoor machines can be in same or different types 2) Ceiling type or inserted type indoor machines will be the best choice 2) Intelligent control 3) Economical running and convenient maintenance: the one to more system may save much more electricity than central system; one indoor machine can be repaired independently without stopping machines in other rooms 4) Space saving: no engine room is needed 5) Uses the famous brand compressor, the control chip and the high quality copper and aluminum materials, and the superior system, offering a higher COP mark 6) Multiple protection and revolution security