OK, so I have a heat prob. Everytime I look in on my box, its about 90 deg in the box until i open the door and it vents out a lil bit. I took two bulbs out, now I'm only running 4 26W 6500K at an 18/6 schedule, My exhaust fan is blowing air, my little fan I have blowing on my crop is running, but it still gets to about 88 sometimes 91 peak during the day(did i mention this setup is upstairs in a pole barn? Could the heat generated up there be affecting my temps? It gets kinda stuffy up there, but its the only spot I have right now. Is there a CHEAP way to cool off my box w/o spending a whole lot of $?