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nicozeg: air on the exhaust of the bong is warm and damp. It's the water you're cooling with air...The water gets colder, and air warmer...
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Well, the main cooling factor in a bong is the evaporation, where energy (heat) is absorbed by this phase change operation. If it were only convection, heat will be transferred from on medium to the other, but in this case is a mix of both.
Also, this bong loop don’t have a heat source; only the pump, that don’t need to be a powerful one. So the bong would be acting like a swamp cooler, blowing cool air.