yea the active air is a hot pile of junk, soooooo loud n hot. the ap100 is much quieter and runs a bit cooler.
I use a 1/4 hp active air chiller, inside the room, but I back it up to my outtake so the hot air gets taken right away. both rooms the res are in the room and i can keep them at whatever temp I like. my one res is more out of the way and is easyer to cool, the res in my blackberry room is directly under a light but I can still keep it cool with the 1/4hp. I think sealed rooms would be harder to cool, in and out rooms I think the floor of the rooms stay a lot cooler than the top of the room, plus my lights are almost at the ceiling