What is the difference between the window type and a split -type airconditioning? Which is more expensive?

Im designing an apartmnt building. In both cases, if it is provided in my units, will i need a cooling tower in the topmost floor? how big?What is the difference between the window type and a split -type airconditioning? Which is more expensive?
In a window type, it's only one unit. Cooling and heating is done in the same unit. In split time, cooling and heating is done in a seperate unit while it is passed through the one installed in side. In the later case, you just need a hole to pass the connectivity between the two units. For the second type, you will need to have a colling tower if you are offering it to all apartments.What is the difference between the window type and a split -type airconditioning? Which is more expensive?
http://www.kelepiryazlik.com answer is here