Originally Posted by TXiceman
You have to decide whether you will need a ducted or non-ducted air for the second unit. Will the thermostat support a second unit?
Simplest one will be a non-ducted unit with it's own thermostat.
If the wiring is already in place for the second A/C, there is a good chance the wiring for a thermostat is already in place. If so, cutting a hole in the wall and fishing it out shouldn't be too difficult. It would be a huge improvement over a thermostat installed on the A/C's lower unit.
Wether to get a ducted or unducted lower unit would depend on whether there is ductwork already in place or easily accessable.
I would suggest a call or email to the manufacturer to see wht your RV actually has in place and where.