When it comes to Air Cooler I guess no Air cooler is as good as Symphony. I bought an Symphony 50T Air Cooler this Summer only for the Reason AC not working due to high temperature and low voltages.
Why not to opt for Coolers to cool your room rather going for AC?
Less electricity consumption and no tension for low voltages as Symphony is so designed that it will work in an inverter also.
Disadvantage part is takes a bit more time to bring the room temperature down and cools only around 300 sq ft radius.
Other than this really worth and value for Money only around 3k.