1.How much will it reduce the temperature ?

This is dependent upon the ambient conditions but, in hot weather, there is typically an 8 to 13° drop in the temperature of the air through the cooler.

2.How much maintenance does it need?

It depends very much on the degree of environmental pollution. Normally, what you need is just cleaning the water tank at the end of the season. In heavily polluted industrial environment, you will need to clean the filter pads by hosing them off. Eventually you will need to replace the filter pads to keep the machine function efficiently.

3.Are evaporative air coolers good for health?

Yes for sure.
They clean the air.
The air used is 100% fresh.
They maintain a very good level of moisture.
They reduce the static electricity.

4.Will I get condensation in my building ?

No, provided the design is based on a balanced ventilation scheme.
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