my hydro set up is a good one i made myself, the water always stays cooler no matter how hot it gets in the closet. My fan blows on the sides of the dwc unit and the shade from the plants keeps the dwc unit cool. water temp is no higher than 74F. Im worried about the fall and winter though because here in the desert it gets cold and snows sometimes. Im gonna have to change evrything from a hot season to cold season, which is adding heaters, less fans, close of ac vents, add more lights for more heat..on and on...I guess i need to move again to a more suitable indoor grow area. The desert is great for outdoor but indoor is very hard..new mexico grower