Which model do you have? Be sure the stainless allen bolts that the door hinges on are snug, Vertex ships them loose and they can be noisey from the vibration. I have 2 Vertex Air 1's mounted on the same 4x4 wooden post. These are the new style with the Brookwood single piston pumps and at 30 ft away you really have to listen to hear them run. Also be sure the door seal is tight. When you unlock the cabinet you should have to push in on the door to make the lock work easier. This will tell you if the seal is tight.Lastly unplug the cooling fan to be sure the noise is not coming from there as I recently had a customer in NY thay ended up with a loud damaged fan from shipping.At 150 ft you should hear nothing. Your system should still be under warranty so lets get it working properly so the wife is happy, let me know if I can be of help, Ted