I tried throwing in my old drop in chiller and that is working great BUT it is noisy as hell when it's on and it's on too much.No I did not find a good sump fan. I bought the biggest and most powerful I could find that would fit my sump. Ugly as hell, but at least it's hidden and not hanging over my tank. lol. At the end of the day, it actually didn't do much for my temperature for my system in my humidity in my home. I had to go chiller route but still use the fan only to help evaporation for a kalk reactor.