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Fiat Ducato 250 Maxi, L2H2
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Doesn't this mean that by adding a second hose for the intake to a single hose unit, the efficiency could be improved?
I've got a spare Midea (Eco Friendly Lite) single hose unit to experiment with...

Edit after googling: Usually there seem to be two intakes. One for the circulating air, and one for the air that will end up as exhaust air.
Some videos suggest that it improves efficiency quite a bit if you add a second hose to the second air intake.
 

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Fiat Ducato 250 Maxi, L2H2
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A guy on YouTube (in German, apologies) is using the condensate to cool the air before entering the A/C:
I don't know how effective this is, but the intake air is certainly cooled down.
 

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@Chance thank you, I didn't know that.

Thanks for posting that.
@GaryBIS figure you might enjoy the video
For completeness, there are a couple of studies that analyse this in detail:

 
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