RE: 1/4 hp Chillers?
I have a 1/4hp Current USA Prime In-Line and I can attest that it will add some heat to the room. I have placed it next to a window that I leave open a crack with a small desk fan blowing the hot air from the chiller out the window. This seems to have mostly solved the problem. As far as noise-- it really does not make much more noise than just the normal background from the overflows dumping into the sump. Cost on the electric bill seems to be about $25-35.
144 G Half Circle Mixed Reef, 240G FOWLR