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Big fans work great. I purchased a 47,000 cfm industrial blade fan, 57" blades and run it at 1/2 to 1/4 speed. Cost $160. It can change the air in the entire 3000sq ft house in just a few minutes on full and keeps the temp in the top of the 30 foot high living room the same as at the bottom. It is very quiet and beleive it or not, even on full tilt, you can only feel a gental change in air, no big woosh. Its quieter and works much better than any overpriced home type fan. The home type fans are worthless as they only move 5 or 6000 cfm on high and are noisey to boot.
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