Originally Posted by mdd1986
If I were you to save lots of headaces I would just use an aquarium chiller. Its basically the same thing you are trying to accomplish with the AC unit except everything is contained in one unit. All you would need is some tubing and a pump. I'm not sure of the min flowrates of cpu and GPU blocks but I would deff get a head rated pump if you are running 30 feet. Iwakis are one the best pumps. Panworld/reeflow/dart are also very good. You could always use a gate valve and such to adjust flow rates. I can't imagine needing more than like a 1/10hp chiller to cool a CPU. Especially at those high flow rates. They are made to chill large volumes of water in a short amount of time.
I've gone with a window A/C unit for a few reasons. For the BTU, a window A/C unit is much stronger and much cheaper. Thos aquarium chillers have pretty weak compressors unless you get into the $1k+ range. I also want to dump the computer heat outside which the window A/C unit is perfect for. An aquarium chiller just dumps it into your house for your HVAC system to struggle to remove.
I bought an Iwaki RD-30. I hope this thing is as good as they say it is, over $300 with power supply. I will be cooling a heavily overclocked CPU and 3-4 graphics cards. 1/10th HP compressor would be no good.