You don't need to buy an big air conditioner. This light and convenient can be mentioned anywhere. When the water is put into the machine, there will be air-conditioning immediately after the power is turned on. Put it on the desk to keep you cool and comfortable, this is a great tool, when you work for home. Power saving, space saving, cool for the individual. It's really a good choice for this hot summer. I'm so happy to buy this product to spend this hot summer.