[scottz]

Originally Posted by firestation12

Think how a RV roof top unit draws outside air in from the sides then forces it rearward through the condenser coil. What would happen if instead air was drawn in from inside the camper then pushed outside?

Thanks for posting this; I would never have thought about this. If I understand correctly, since the portable unit is entirely inside the living area, ideally, there should be two air circulation systems.

One is the recirculating system that draws air from the living area, cools it, and returns it to the living area (recirculating).

The second is the air flow needed to get rid of the heat removed from the air. With a single hose portable unit, the air comes from the living area (creating negative pressure), passes over the heat exchanger and is exhausted outside; not a great idea. With a dual hose portable unit, air comes from outside, passes over the heat exchanger and is exhausted back outside.

Correct?