Cooling fan

 A swamp cooler (more formally called an evaporative cooler) is essentially a large box-like frame containing a big fan and walled in by water-wetted pads, usually made of cedar shavings or cellulose. The fan whooshes the hot outside air through the dripping pads (which are continually soaked by a water pump), evaporates water molecules from the pads. The fan then blows the water-cooled air through the house and out a deliberate vent.
http://www.aolan-china.com/

Air coolers system

A fully ducted evaporative cooling system is the most economical way to keep a home cool .  AOLAN can show you the widest choice of systems on display in its showrooms, including a range of working models.
AOLAN supplies and installs the top brands including...