I am lucky enough to live in a climate with low humidity so swamp coolers work well in the summer and they move tons of air. You can get a Bonaire Durango that will move 5000 cfm and keep everything nice and cool while only using 200-300 watts depending on your settings. This only works in low humidity climates otherwise you are better getting off with a high cfm fan or two and doing a push or push/pull type airflow setup to keep the heat out of the room.