Well they are paying all the shipping etc, I'm at the point where I think I could run two 250 MH lights & not use a chiller at all, I know one thing, the room temp. makes a big difference. One other thing Is it is loud enough when running, not the quietest but I haven't any other 1/4HP chillers to compare to it, only smaller & they were loud for the size also. With just the CL pump I can't really hear anything, the sump return then it isn't so bad but then add the skimmer & chiller & your getting to be on the noisy side. Still not sure If I will continue without using my skimmer or not, that there will help reduce a small amount of heat I'm sure. I know controlling room Temp. & Fans can go a long way in cooling a tank, sorta like having a water tower chiller like used in Power generation. Heck That may work way better IMO more efficient!