Ideally, the indoor unit of the air conditioner should be installed at a height of approximately 2 meters, so that the air in the space is distributed evenly, but also always placed in such a position that the conditioned air does not fall directly on you.
Also, the outdoor unit should be placed in a location that provides easy access for maintenance, but at the same time in close proximity to the indoor unit, which should not exceed 15 meters. The installation positions of the units determine the route and length of the refrigerant pipes, which ideally should be shorter than 8 meters, so that the performance of the air conditioner is not affected.