I am giving 4 star for this Hitachi model. I had purchased this 2 years back. Cooling is great till now. There is only one issue that consumption of energy is high for a 5 star model. So, if you don't bother than go for it. AC is superb. Otherwise, you can purchase inverter AC. No need to look back Excellent in cooling& service, think about price as costly. I am blessed with two sweating sleepless nights because I made a great choice of buying a Hitachi product. Cooling system is awesome and not any sound noticed. its a really satisfactory productof AC.