For small spaces, a room air conditioner can be just the right type of cooling system to bring relief from the summer heat. The most common type of room air conditioners are rather small and are designed to be installed either into an external wall or into a window so that the unit has good ventilation and airflow. In recent years, portable air conditioning units have also been introduced, which feature a flexible hose for venting and casters for ease of movement to different rooms.
