I used poor man's A/C for a while. I know i've posted this before but it's got a lot of upside, one being price, the noise is very short term and if possible in another room.
Basically get a honeywell turbo fan 30" or so, put it in another room facing outward and at an open window. Open the room window you want to cool. When the temperature changes outside hit it full blast and blow the hot air out of the unit, sucking in the cool air from outside in the room you are cooling. The vacuum it creates can cause you to exchange your air very rapidly.
If it's very warm outside you can keep the fan running over night at a low speed. You will be amazed what this can do!
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