This is an amazing product by Hitachi.All the pipe are made of copper.High capacity of cooling.It is of 1500 Watt. If the Ac on for 1 hour only 1: 5 unit is necessary.I am using the product.I am fully satisfied.You can also be control the cooling capacity by remote controller. It has 3 mode 1 - Automatic 2- Cool 3-Dry. You can also controll the cooling capacity of 16c Wich is very comfortalbe and chill weather.You can contact with the service provider easily at any time.They r also very helpfull. So dont waste time. Chose the best Ac from Hitachi and keep happily.