Among acs I found hitachi the best brand I can trust for. I had Kazo model of window ac 1.5 ton and most of relatives also have used hitachi.
The review was excellent .it is a powerful machine with very stron chilling effect .many inbuilt features of temprature monitoring and control.easy to handle.
I have read few reviews people complaining about less cooling.i would say with confidence that if you do regular service as per requirement of machine you can never get anything better than hitachi.
it is our efforts and care that prolong machine to give its best efficiency.so a part from blaming I would reccomend every one to consider hitachi as top most effective and efficient brand along with o general ac company.
hitachi is a reliable brand and service repairmaintainance is very fast and reasonable.
a true delight for indian market.
good luck guys make good choice
rgds