[chbla]

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.

 

[chbla]

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.

 

[chbla]

@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:

Experimental study on the effect of condensate water on the performance of split air conditioning system

A method of using condensate water to reduce the airflow temperature around the air conditioner condenser and improve the performance of air condition…

www.sciencedirect.com

https://www.researchgate.net/publication/254306480_Use_of_condensate_drain_to_precool_the_inlet_air_to_the_condensers_A_technique_to_improve_the_performance_of_split_air-conditioning_units