When the A/C died in my Metro and the shop wanted several hundred dollars to replace the compressor, I considered something like that for months. (Well, except I was thinking about replacing the rear seatback with some plywood and mounting the A/C through that, then venting the heat out of the trunk.) My 10,000 BTU window unit only draws 450 watts (about 32 amps at 14V), so I figured I could wire it into the battery and not overpower the alternator.
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