Evaporative air conditioners offer lost cost energy efficient alternatives to refrigerative air conditioning
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.
An Australian government website provides some important tips to bear in mind when operating an evaporative cooler:
•   Always leave some doors or windows open so that the cooler can drive out hot stale air
•   Ensure that you use only clean and fresh water, hard water or water that contains a lot of minerals will adversely affect the filters, which will need to be cleaned, repaired or replaced more often than is ordinarily necessary
•   Portable air conditioning units need to be kept clean to ensure that the water reservoir doesn’t grow bacteria or algae
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