It is super quiet. You can barely hear it over the normal office background noise. I mean you can of course hear it if you stop and listen, but it is not intruding on the office noise level at all.
And yes the unit is cool enough. It moves a lot of air. That is why I put the plates in the front to force the air over the servers and not empty space., just to be safe though. I have to change the filters bi-monthly.