It takes heat (or energy) to convert water to water vapor. In an evaporative cooler (bong type) water is broken up into smaller particals (with a shower head) to increase the surface area of the water. And air is forced in the oppisite direction of the flow of water (up) to incrase the contact of air and water. Water will be evaporated into the surrounding air. Since evaporation requires energy (heat) to take place, some of the water will be lost to the air along with large amounts heat.
You can actually reduce water temp below ambient temps with this tpye of set up. How ever efficantcy depends on not only ambient temps but also relitive humidity.
Unless your romm is really small and badly ventilated (not healthy!), the air humidity in your room shouldn't reach a point where it actually inhibits the bong's performance. Just watch out for mildew in your room!
Tip: Don't use too many fans! You'll lose lots more water but for very little gain in cooling and not all water is lost as evaporation (that does the cooling) but also as minute water droplets.
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