Portable air conditioners are most often used in smaller rooms when building rules or regulations prevent the installation of a window unit. They cool the air with a condenser coil contained inside the unit and expel warm air through a large exhaust hose. This hose goes from the AC to an airtight window kit, sending the exhaust air outdoors. Window kits are generally included with a portable air conditioner.
The condenser and exhaust fan are located within the same casing, making these units louder than other in-home air conditioners. Advantages of portable air conditioners are that they are relatively light and usually have wheels, making them easy to move between rooms, and their installation is simple.