I have an aqualogic 1/4hp chiller. It's basically like a refrigerator compressor, adapted to use for a fish tank. It doesn't have service ports, but any qualified hvac guy could put them in it easily if it ever needed a charge. It's not like the typical chillers that you can't charge or work on. I don't know what I'd want for it or if it's enough for your setup. I know I wouldn't expect to get a lot for it, since I can't use it. It wasn't anywhere near big enough for my setup and wound up heating up the room more than cooling the water, because it ran pretty much nonstop. I did have three metal halide bulbs though.