An air washer and the Ambiator both work on the principle of evaporative air cooling. An air washer brings down the DBT (Dry Bulb Temperature) of ambient air to a temperature, which is very close to the WBT (Wet Bulb Temperature). This is done with the addition of a lot of moisture in the ambient air through direct evaporative cooling.On the other hand, the Ambiator brings down the ambient air DBT to a temperature much lower than the WBT through the combination of indirect and direct evaporative cooling. This is obtained by adding only half the amount of moisture that is added in an air washer. This results in higher degree of cooling with much lower moisture levels.The HMX-Ambiator is an IDEC (indirect-direct evaporative air conditioning) machine which is quite different from single stage evaporative coolers and air washers.