Concerning a possible compresor system. You really can't use CO2 as it doesn't have a liquid phase at the pressures you'll be dealing with, so pretty much untransportable. Also you would be able to get really cold temperatures with it but only until the lump on the core disociates away, then you need to keep shovelling more on, plus you can't make your own, high pressure needed to do that.
2nd, don't try a compressor system without freon, it only works because the freon vaporises when heated, this takes away alot of heat. You can't get air to liquify using normal compressors, and using the little expantion will get you almost no heat transport.
Edward
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