I am thinking on cutting back on my electricy bill, so I am thinking of using one of those cooler fan, they are the ones you put ice inside. my sun hut inside is around 80-90 during day time, 74-77 during night (18/6). using 2 6' inline 250cfm each with oscillating fan. i sometimes use my portable AC but my electric bill is insane. oh and im running 2 400 watts HPS inside my grow tent (4x4x7)...what do you guys think?