Mine is 4x8x8 and I don't ever wish it was bigger. I bought a nib a/c unit off kijiji and had a local guy hook it up with a special control for $50 which is totally programable. In early fall it will go down to 4 degrees in under 1/2hour. Next year I'm adding a heater that will also be hooked into the control to keep it a 4 degrees no matter what's happening outside (hot or cold).
That said I'm not sure if I would go the a/c unit in such a big cooler as mentioned in the op.
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