When you buy a condensing unit air conditioner, you are not actually purchasing the air conditioner itself, but rather the refrigerant gas that is used to transfer heat into the cooler. This means that if you have a portable unit, you will need to place it somewhere where it can be cooled off from time to time. If you have a larger unit, such as an industrial one, then you will likely have to move it outside to prevent the condensing unit from overheating and potentially damaging your unit. It is always advisable to ask questions before purchasing anything, especially if you are going to be installing an air conditioner in an area where you will be using a compressor to cool the air and not a unit of this type.
There are several factors that must be considered when installing the condensing unit air conditioner, the most important of which is the size of the area that you want to cool down. If you live in a large apartment complex or condo, then you may want to get an industrial model that can easily be moved around in order to keep the unit from overheating. You will also need to consider whether or not the unit will be positioned outside. If it is located indoors, then you may not want to have it mounted on the roof, which can be extremely dangerous and not something you want to do.
Another important thing to consider is whether or not you need to use duct work or an air conditioner for your unit. Some units are actually only designed to run on electricity, while others can be hooked up to duct work. There are different models available that will accommodate almost any type of cooling system, and if you have no idea what kind of unit you will need, you can usually find all the information you need online.