The two units that make up the mini-split HVAC systems are the slim-line outdoor condenser and an indoor air handler. The condenser supplies coolant to the handler through refrigerant lines, which cools the air.
Mini-split HVAC systems can be installed virtually anywhere in a building. This includes basements, attics, garages and offices. They can be mounted up high on a wall so they are out of the way and can dispense air throughout the entire room.
Condensers are typically installed outside somewhere, such as the backyard. However, they may also be placed on a roof in order to save space and keep the backyard aesthetically pleasing.