Hitachi ac is great I am also using hitachi ac.its cool my room perfectly.its provides very powerful cooling.very silent operation and powerful fan.it has extra heat exchanger to run at elevated temp.kahi kahi par service is not good but not everywhere.in some hitachi ac there is a problem of noice.i mean some hitachi ac creates a unwanted sound that disturb the customer or users in sleeping times and also disturb others.hitachi ac quality is good not very good but overall ac is ok.i think in 20 thousand or upto 25 thousand we are getting good ac.