I love my new A/C.  First, it's smaller than my old A/C and works so much better!  Second, it's very easy to install.  Third, it's a quiet unit.  Other than the expected "whoosh" of air coming out of it, it's extremely quiet.....no hums, no rattles, etc.....just cool and quiet.  I'm very happy with my purchase and the great job it's doing for me.