Because of the high power consumption air conditioners, if room adjacent to all rooms air conditioned, the air conditioner refrigerant pipe connecting with each room, however, and the overall capacity of electricity in the dwelling unit, 2 units for an outdoor air conditioning equipment can also be finished in a multi-type units. First, the air conditioner is the outdoor equipment and sets, and expand its place if it is outside the machine room to the outside of the air conditioner is not wanted. HOA must clear the issue of capacity. It is necessary to determine the capacity of the distribution route in each room.