[header] How to install a split system air conditioner [title] Select an unobstructed location on your interior wall to mount the indoor air conditioning unit. [substeps] Avoid direct sunlight and heat sources. Avoid locations where gas may leak or where oil mist or sulphur exists. 
The indoor unit requires at least 6 " (15 cm) of open space surrounding its top and sides. The unit should also be mounted at least 7 feet (2.13 m) above the ground.