I'm not sure how I will keep my grow closet heated to 78-80 degree's when I install the 4" inline fan and carbon filter. I will most likely have to put a heater in there but won't the fan draw the heat out and replace with room temp. 70 degree air? 2x5x8 tall closet, 1 300 watt LED grow light 1 maybe 2 plants at a time. Plus small heater if needed. Thoughts or idea's to straighten me out ?