As evaporative coolers have a humidifying effect they work best in dry climates; doing little more in humid climates than moving the air. There are various types of evaporative air conditioners:

• Evaporative portable air conditioners, which are used to cool one room at a time and move around on wheels. They need to be filled with water before each use.
Some portable evaporative coolers have heating elements for warmth in winter.
•    Fixed unit, which are usually mounted through a wall or window. These units have a permanent water connection and so don’t need regular filling. They can be used to cool more than one room at a time.
•    Ducted systems, which are installed on roofs. They can be water intensive and noisy.