Well it's hand in hand.
Heat above water = Evaporation.
When I researched on RC, it's generally the removal of the evaporation that cools the water.  If there was a sheet of glass above the water to prevent evaporation, and you only removed the heat build up, the water would not cool down.
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					Originally Posted by TheReefGeek
					
				 
				Fans are not just for evaporation, they also remove the air that is heated from the MH bulbs and in this case, ballasts.    
 
I would get the electrical and ballasts out of there myself as well. 
			
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