2nd non-ducted A/C ceiling unit (or portable?)..questions...

Checked it today when it was 75 degrees inside and outside. The air just inside the A/C vent was 43 degrees. So I think the unit is working normally. Something about my rig, maybe the big window....it's very hard to cool off. So...I think a second unit is definitely in order.

Wondering though, as I mentioned -- if the schematic shows a 2nd a/c option at a certain vent does that mean it's most likely wired for a unit, whether that option was chosen or not?

And if it's not?

Thanks for your help...