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    ways to cool down a grow room?

    i have a 4x6x6 wooden shed outside running 600w HPS. i have an 8 inch booster fan blowing in outside air, and a vortex fan running through my hood for cooling and exhaust. ive been checking the temp in there and its getting like 86-87 deg at the hottest point (always 2-4 deg cooler outside temp)...
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