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You need fans to blow the air OUT not in, and create a chimney effect between opposite sides of the building.
A small out blowing fan can be enough, if run all night.
Blowing out will cause air to be sucked in from the opposite side. Having multiple fans will only mess up the air flow and reduce the efficiency. Better two fan on the same outgoing window.
Of course, that will never cool down more than a few degrees above outside temp because walls thermal cycle will bring inside day heat at night and bring inside night cool in daytime. Specially thick or well insulated walls are designed to do exactly that.
So yes walls will warm you up at night, that is not avoidable. A well insulated wall will do that instead of bringing heat in during daytime... But heat is there and must be dissipated that's physics. Night time is the best option.
Edit: blow out at night. During daytime blow around, best way to keep cool is move that hot layer of air that get stick to your skin with a fan. Same temperatures but so much more bearable.
That's the basic theory I'm going with. Imagine a Y. Each of the top ends are two rooms with one window each. They are connected via a hallway to my bedroom on the bottom, which has two window on the opposite side of the building. The wind has the slightest tendency to blow down that Y so I have the air move in that direction.
The only wrinkle is that even with two fans in that hallway to bring the air in, there's still 3 temp difference between the top and the bottom, it gets to 1 if I flip one of those bottom fans to bring air in.
But I also have windows that open horizontally, so I have plenty of open air above the windows that I occupy with venetian blinds, so I could probably do a better job of sealing that up to improve flow and decrease backwash.
Edit: This comment brought to you by !dull_mens_club@lemmy.world
Don't forget to circulate the air within the rooms, not just move air through them. Even with airflow across the apartment, there's often pockets of air that rarely get circulated. Also, things like furniture, closets, and stuff will hold heat and warmer air.
For me, often just a ceiling fan or a fan blowing vertically from the floor in larger rooms is enough to make a big difference.