I have a 4-5 year old Amcor 9000btu portable air conditioner up in my room, it seems to do a fairly good job of cooling the room although it does seem to work pretty hard to keep it comfortable (around 22ºc - 23ºc), that might sound quite high but it's a lot more comfortable since the humidity is reduced.
Anyway, I have read about this type of air conditioner creating negative pressure in the room which as a result causes it to pull in warmer more humid air from the surrounding areas, this is because air from the room is used to cool the condenser and exhausted outside. I remember another poster on here saying they modified the unit so it would use outdoor air instead to cool the condenser, I was just wondering how much of a difference it would make? Apart from cooling down a bit quicker initially when the air outside is cooler and obviously not pulling in warm air from the rest of the house..
I have inspected the unit closely when I had it open to clean it and it appears to have 2 completely separate air paths, there is an intake with a carbon and mesh filter which leads to the cooling coil and back in to the room and another 2 towards the bottom which just have a mesh filter on that leads to the hot condenser and out through the exhaust..
All I reckon I will need is some cardboard, flexible ducting and some tape, tbh it's an experimental thing but was wondering if it would be worth the effort?