Have pulled inside covers off both AC units. In fact the one that's midway through the rig (supposed to be for the main living area seems to blow more air to the bathroom/bedroom area than the living area. Had an RV Tech check and he said at the farthes AC vent in the living area, it reads to specs. I have trouble with that as you can hardly feel a thing coming out of them. But, I want to say thanks for all the suggestions. Guess I'll do a cost comparison of 90% blockage with screens on outside, and having another AC added.