Will evaporative cooling work in high humidity areas?
Evaporative cooling works well in quite a wide range of climates. If there is a lot of moisture in the air, it has less capacity to cause evaporation, which means the air does not cool down enough to give as good comfort.
Accordingly I dont recommend evaporative cooling in tropical areas. In subtropical areas I generally only recommend evaporative cooling where there is a particular reason for example you an on solar power.
However in most of southern and central Australia evaporating cooling is an effective way of keeping cool and saving money while helping the environment.