[Kidster]

Hello everyone.First time in the site but from what I have seen so far looks like a great site.
I have already learned stuff about my camper I didn't know and hope to learn a lot more.
Not sure if this is the place to ask questions.
I have a 2005 Montana 3500RL with 4 slides.
I have been doing some reading on the site about a/c units and one of my questions are about making my new a/c unit work better.
I read on one site about making sure the air box seal is ok.Not sure what they mean by that and hope someone can enlighten me.
Also a question about adding a second a/c unit in the bedroom.There is a small box in the sealing right beside the roof vent that says something about a/c unit but not the plug I need to plug in a new unit.
The thermostat in the camper shows an option for 2 units.
Any help would be appreciated and thanks for any help.
Ken