A low-profile air conditioner is designed to take less space in the window in which it is mounted. This type of design allows better visibility through the window and lets more sunlight into the room.
A window air conditioner blocks part of the view of the window in which it is installed and requires removal or winterization during colder temperatures. This type of unit also tends to be louder than central air systems. Window air conditioners, however, are generally less expensive to purchase and operate than central air units. Window air conditioners generally do not require professional installation, but larger units can be difficult to install because of weight.