Dexter you have forced me to upgrade my 10GH/s sawhorse juryRIG monstrosity.
I thought your rig was so cool that I showed it to .... wait for it .... my wife.
Her response was "Why don't you do that?". DOH!

One question. What are the specs on your AC unit? I assume it is a dedicated unit not used for the rest of the residence. I mean if you are pulling 12KW at the wall that is >40K BTU/hr which requires some "real" heat transfer.