[phil]

FWIW, (non van use)
I have a 12k window unit with the exhaust reduced to 8" round metal duct, the exhaust air can reach 135°f . The delta IIRC can range from 30° to 50°f even though I over pressurize the fresh air intake.

I'm guessing your exhaust vent would be toasty warm not to mention restricting the air flow

 

[phil]

fwiw,
Seen someone box in the condenser inlet, making it a dual hose.

 

[phil]

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.

Thanks for posting that.
@GaryBIS figure you might enjoy the video

 

[phil]

I’m not saying this is an issue with condensate ,,, but I recall 1976 & something about the water ,,,

https://en.wikipedia.org/wiki/1976_Philadelphia_Legionnaires%27_disease_outbreak

@el Jefe. What say you!!

The video is about the condenser inlet and not the evaporator inlet.

 

[phil]

Can't be any worse then not changing the cabin filter in a PM.

Personally I would focused on cooling the condenser coil itself.