Indoor unit by AUX, for multi air conditioners. Multi-split air conditioning systems have the ability to connect one outdoor unit with more than one indoor unit. This is the most economical solution for different rooms and to save space on our balcony or garden. However, we must ensure that the outdoor unit is sufficient in terms of power to meet the needs of the connected indoor units for their simultaneous operation. Additionally, the outdoor unit should be placed in such a position that the length of the connecting pipes with the indoor units does not exceed the length specified by the manufacturer.