It's a Oil/Gas Compressor simular to what Freezers use. Was modding an Antec 900 and had it on the outside but went to install in the case and broke a line. The compressor is a tad to big for the Antec but I can get around this by going up to a full Tower.
The Ultimate goal is to drop the Temperature in my case to around 40F and keep a few Beers in my Computer.