Air Conditioner Types
There are different kinds of air conditioners and they are useful in different situations.
Split AC Systems
A split AC system has two distinct parts, one inside the house and the other outside of the house. The cold expansion value and evaporator coil part are inside your home. The system is placed in your furnace or other air-handling system. The air-handling system blows air over the coil and through the ducts throughout your home. The hot part is the condenser unit which sits on a cement slab outside of your home where it releases heat.
Ductless AC Units
A ductless AC system is a split system as well. But, the cooling unit that takes heat out of your home is mounted on an inside wall. It contains the evaporator and a small fan that blows cool air directly into the room where the unit is mounted. The outside part is the condenser and, like with the other split system it is placed outside of your home. If you want to cool more than one room with this kind of system you typically need wall-mounted cooling units in more than one room.
Packaged AC Units
These are inside units that contain all of the parts of the system in one box. The heat is generated using natural gas or a heat lamp run by electricity.
A packaged terminal AC system is also known as a wall-split AC system. They are usually installed in the wall of a building with the cooling parts on the inside and the condenser parts of exhausting heat on the outside.