I believe what is being said about the Vitrofrigio being quieter than the
Norcold.
But sitting here next to the Norcold that I've been sleeping with for the
last week I can say that mounted with Sorbothane pads underneath and rubber
grommets on the screws on the front panel I have virtually no noise, a very
slight hum if I listen for it.  So as long as I don't set my tea kettle
wrong on the grill (and sometimes take it off) I get no vibrations that wake
me in the night.