Window room air conditioner is installed as a primary source of cool air in the room or as an addition to the central AC system. These units are made for three different window types: standard, slider and casement. This air conditioner takes hot air from the room, cools and dehumidifies and returns it back inside. This is the most popular air conditioner type. Its disadvantage is that it takes up the window space. Insert pic here.
Wall air conditioner is a unit that is built into the wall of a room. It has all the same properties as a window air conditioner. However, it requires additional wall opening to be created. The disadvantage of this unit is complicated installation. The advantage - it doesn't take up window space and can be installed at any height. These units have a better weather barrier than window air conditioners. Insert pic here.
Portable air conditioners are self-contained units. Usually, they have casters to simplify their moving from one room to another. These units have a long and flexible hose that needs to be attached to a window to exhaust hot air. Portable air conditioners are usually higher priced than wall and window units. Their two main advantages are: easy installation and portability. Insert pic here.
Split-system unit is a less popular type of room air conditioner. It consists of two parts. One is hung on the wall inside the room and one is installed on the outside. They can be used to cool more than one room or large premises. Their disadvantage is the cost. These units are priced higher than other types. They provide more security than window types since the windows don't need to be open. Insert pic here.