I have got hitachi window ac 1.5ton. its been 3 years, this is the fourth season for this machine and it makes noise badly. Last year the whole season was a co stant struggle with it. N service by hitachi is very expensive and delayed. The boys who come to your house for repair are not the hitachi employees but just the local mechanics. In my opinion its nothing sensible to first purchase a costly product and then avail even higher service expense. Better go for voltas. Cooling is like any other ac.