Wow that must be an incredibly powerful fan. My box fan (regular el-cheapo too) only pulls 13W on high! Maybe there is something wrong with yours?
I'd have to say turning the AC off is definitly more efficient. Its going to take way more power to maintain X degrees below ambient all day vs turning it off and having it come back on to maintain X degress below ambient for the few hours you are home.
If you hate comming home to a hot house, use one of those plug in timers like you would use for a block heater. Have it come on an hour or so before you get home and voala, you save energy and still come home to a cool house.
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