Update, run testing...
We let our new Engel MT-45 run for 24 hours on a mid setting, or a "3". It cycles a lot.
And it has while not unpleasant, but somewhat disturbing hum when it does.
Last night at 10:30, I put two one gallon jugs of water in there, and set the dail to max cold, or "5", to freeze.
When I got up this morning at 6:30, they were solid. So it does work. And quite well!
I turned the stat back to 3 again, and I am noticing it has gone from constant run humming, to cycling. About every five minutes, EVERY FIVE MINUTES, it hums for about two or three minutes, then nothing, five later, hums happen.
I'm gonna call them tomorrow...
At this rate, it would most likely run my batteries out before we leave the driveway...
Yikes! Right?