https://www.cooling-heating.net/ Through the wall air conditioners run similarly to window units, by retrieving air, running it through coils, then sending the cooled air into the room. They are installed in a hole in an exterior wall, and require installation of a sleeve due to their weight. These units have a BTU range between 7,000 to 15,000, with a coverage area between 200 to 800 square feet. Pros of Through the Wall Air Conditioners Save on space in a room Efficient Lasts a long time and is a longer term solution Easy to replace when you have an existing sleeve and most units are industry standard sizes Doesn’t take up window space Cons of Through the Wall Air Conditioners Complicated first time installation Smaller coverage area