heat problems

hey guys im running 6x600watt hps.......everything is set up correctly., i have a 700cfm exhaust running sucking in a cool 12 degrees celcius.... still hitting 31 degrees celcius rrrrrrrr....... Im thinking of getting 6 air cooled hoods 6'' duct with a 500cfm exhaust pulling the hot air out.....n e cheaper solutions lol???
 
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