As for too much heat it is best to let it be absorbed back into the biggest heat sink in the universe. And that would be the UNIVERSE. "Nocturnal Radiation" is a passive method. It let's the black night sky cool the water. As with any heat exchange the more surface area exposed to the night sky the better. Then you add evaporation techniques. Coupled with venturi methods.
Smart building is the first step. Making stupid buildings livable is much more difficult than designing a smart building to begin with!