Where you place the indoor air handlers and outdoor units impact the performance and comfort of your mini-split system. When determining where to put the indoor unit within a room, you must factor in accessibility and air distribution. These units require regular filter cleaning and maintenance, so you should place them where they can be easily and safely accessed. They must also be centrally located within a room to allow the air to reach all areas of the zone. Wall-mounted units should be at least eight to ten feet from the floor. When placing the outdoor component, keep open space available to facilitate free air movement. You also want to make sure the unit is well protected and that there's a clear path for air exiting the fan to vent outdoors.