If possible, i would still try to turn the A/C on if you are trying to cool the water down since you mentioned "without A/C''. The reason being that if your ambient room temp is 80 degrees, the water isn't likely going to cool down much if any at all past that.
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29 Gallon tank
~6 Long Finned Black Tetras
~3 Bosemani Rainbows
~10 Serpae Tetras
55 Gallon tank - Planted
~2 Pearl Gouramis
~2 Platys
~16 Neon Tetras
~6 Glo Light Tetras
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