I have been searching for an efficient air cooler for our recreation hall and finally bought the symphiny diamond air cooler.The capacity of the cooler is 41 litres which is a high value on comparing with other air coolers.The power consumption is about 110W.One of the best features of the cooler is that it consists of a powerful 368mm/14 Rustproof fan.This was one of the main reasons why I bought this item.This is a remote controlled air cooler.The company suggests that it should be used in rooms of less than 300 sq feet.Fortunately our hall is only 257 sqft.Also the sound of the cooler is very low.So as a whole the cooler is apt for our hall and is working efficiently.