It must be noted here that both window and wall air conditioners are more cost effective when compared to central air conditioners. However, each of these system has some features different from one another which in turn makes one of them better than the other. For instance, as wall air conditioners are permanently sealed into the walls the chances of cold air leaking out of the room and warm air leaking into the room is very less. As wall air conditioners are permanent fixtures the chances of leakage are almost negligible. However, at the same time one must keep in mind that opening needs to be created into the walls and so installation of wall air conditioners is quite a complex task that requires professional intervention. In fact, sometimes installation of wall air conditioners are not allowed in rental properties.
On the other hand window ACs can be easily installed as they fit right into an existing window and may not even require professional help. As Window ACs are easy to install the installation cost of these appliances are also reasonable. There are different kinds of window air conditioners available which can fit in both vertical and horizontal windows. However, it is recommended that while you go to a store to buy window AC it is best to take accurate measurements of your window along with you.
A wall AC comprises two parts the outdoor unit and the indoor unit while the window air conditioner has all components into a single cuboid unit. Thus, when it comes to space it is obvious that wall air conditioners require more space than the window systems. However, in case both these appliances you need to keep in mind that the outside unit should be placed in a well-ventilated space. If that is not the case, the air conditioner will strive hard to give you effective cooling.