get more intake fans flexi ducting so you can put the fresh air where the plants need it and anouther osilatating fan to blow between the tops of the plants and the light,or the best thing is to pay the money and buy that swamp cooler,(you only get out what you put in if you grow cheap you will get shit bud ) you have to do what you have to do.If it was one of your kids you would buy it,its the same,good luck:thumbsup::thumbsup: