So I have been thinking long and hard. I would love to try and combine several cooling solutions to try and create a working sub ambient cooling system. The freezer method with the radiator in the freezer. Why this does not work: Freezers are not meant to keep constant sources cold. The unit would burn out before long. How this could work: Running a series of radiators before the water gets to the freezer to make sure the water before entering is already ambient temperature. Using an antifreeze coolant in the lines, I could even submerge the radiator in the freezer in a bucket of frozen water. Why this does not work: Condensation will build up on components inside the PC one the coolant reaches the computer again. How this could work: Submerge the components in mineral oil. The thermal properties of the mineral oil should be enough to prevent condensation from forming on components. Let me know what your thoughts are if this could be doable or not.