I'm very happy with my chiller. 1/3hp aqua logic delta star. It's set up on my patio, and I ran plumbing through the wall to it. No fans for me, so I have pretty low evaporation (=low humidity indoors, and less load on the AC). Even with nearly 300g of water, this chiller does well on my tank, running for about an hour each time it clicks on (set to 81 +-1).