Hari, I am dismayed that your portable air conditioner is not performing as expected. I know how frustrating it can be to adjust to the sounds from a new appliance. It is normal to hear ‘high pitch chatter’ a sound of rushing air, gurgle/hiss, pinging or swishing and vibration. These are all normal. For more information of normal sounds during operation, please refer to page five in your Owner’s Manual. For more trouble shooting help, please reconnect with us directly by calling Mon-Fri, 8a-8p or Saturday 9a-6p EST @ 888-203-1389. *Ruth