There is a fan, so you can hear it running. I took my electric heater out there and the fans sound about the same loudness. It is louder than the Maxi-fan but much quieter than the original heater. The sound comes from the heater vent, which in my case is over by the door. The cold air return makes no sound, which is good because it is under the bed.
It makes the whole compartment warm pretty quickly. For a CT13, I would say that it is the right size heater. I haven't used it over night yet, so I can't tell you how often it cycles.
It doesn't take much when it is on. How much it will drain the battery
if it is on all night without Mouse being plugged in I don't know yet. It seems that if I am boondocking
, I will get two days with everything else I am doing before I need to recharge. A reason to install a solar
I think it is a very good choice of a heater. The heat is nice and even, you are warm in bed, and when you get up in the middle of the night to use the port-a-potty it is warm there too. There will be no frost on the comforter when you wake up in the morning. All the combustion gases are outside the compartment! You can hear it, but it won't keep you awake. It take up much less space and weighs less than the original heater.