With the summer upon us, most of us are looking to buy air conditioning units to keep cool during this summer. But how does one go about picking the right air conditioner for you? The general rule for air conditioners is that one size does not fit all. So it is important for one to sit down and make a list of his requirements before he goes for a purchase. Also be sure about your budget before you look up the products. The following are the main types of air conditioners 1) Window Air Conditioners. The most traditional type of air conditioners is the window type air conditioner. This consists of a single unit system, which contains the whole package. This system is typically placed in a hole in the wall (made specifically for this purpose), or in a window. This unit is designed so as to reject heat through the outer end, and cool the room through the other end. 2) Portable Air Conditioners. Although very noisy, these air conditioners provide a lot of value for money. It consists of a single unit that contains both the heat rejecting and the cooling components, and pushes out the heat through a hose attached to the air conditioner. This type of air conditioner can be moved about with the help of its attached wheels, and is one of the most economical options available. 3) Split Air Conditioner. This is one of the most recent additions to the family of air conditioners. It consists of two units, connected to each other through a hose or a pipe. The cooling unit is kept inside the room, usually attached to the wall, while the heat rejecting unit is kept outside the room. The noisier part is kept outside the room. The heat rejector unit is usually placed in a shaded area so as to obtain maximum efficiency from the air conditioner. 4) Central Air Conditioner. This is possibly the best and most efficient air conditioning system. This consists of a central air conditioning system which is usually placed on the roof, and is connected to every room of the house through ducts or hoses. The main drawback of this system is the possibility of over cooling in a single room because of insufficient cooling in another room. Now when it comes to picking one, make sure you go through the hidden costs involved, like installation, servicing and maintenance procedures and so on, because it is very essential that all these costs come under your budget or you are gonna end up taking high interest loans.