https://www.swtc.edu/ag_power/air_conditioning/lecture/basic_cycle.htmThis explains basically how it works, same principles for refrigeration and air conditioning.
To heat, one must produce heat. To cool, one must remove heat. They are not called air coolers, they are air conditioners as removing moisture is a part of the cooling effect. The laws of the gases involved are what governs the amount of heat that can be removed.
With that said, what they are trying to explain is that the return air (the air inside the RV that is going into the air conditioner) is limited by science, physics, thermal laws, etc., as to how much heat can be removed before the conditioned or cooled air can be blown back out into the room.
If there is a problem such as what appears to be, then the air from the room is not being drawn in as it should be, it is sucking in the air that has just been cooled instead. So the temperature coming out of the vent is not actually the air from the room, it is the air that should be blowing into the room.
IOW, the already cooled air is being sucked back in and re-cooled thus it appears that the air conditioner is defying science...
I hope this helps!
