The refrigeration principle of everything is similar. There must be a radiator in one direction. If you simply separate the space and put the air-conditioning fan in, the part facing the air-conditioning fan will be a little cold, but it will dissipate heat at the back, so the temperature in your small space is still the same.

If you want to get better results, you should learn air conditioning, blow air conditioning in one direction and radiate heat (so all air conditioners have external machines), that is, you put the air-conditioning fan in a small space, but leave a hole in the cloth cover to face the radiator of the air-conditioning fan, and you can get a slightly better cooling effect. But if your roommate understands why you did it, he may hit you. ...

If you just want to sleep comfortably, it is still feasible. ...

In fact, we all open the window for air, and the fan blows hard after cooling ... the effect is still good ...