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There are two types of these units:
  • Single hose
  • dual hose

The dual hose units bring in outside air through one hose - run it across the compressed / condenser side - and then exhaust it through the second hose.

The single hose units pull in the pre-cooled air from inside (the van in this case) - run it across the compressed / condenser side - and then exhaust it through the hose.

The net effect is that a van with the single hose style will need a fresh air intake to make up for the air flowing out of the hose. Without this intake air, the flow through the exhaust hose will be too low to work correctly. It does not take long before it becomes annoying that the cool air is being exhausted out the hose.

The dual hose units are pretty dramatically more efficient - I am not even sure how they still sell the single hose units.
 
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In theory at least, the condensate water could be collected, sterilized, and used for rinsing off at least some items.
 
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