Thanks trance........

Well, I removed the flex duct, getting rid of the bends that were certainly cutting down the CFM of the exhaust fan. The filter is now mounted directly to the exhaust fan. The fan is still on top of the tent, outside of it.

After re-doing the exhaust and filter, I closed up the tent. The temp was at 82.5 F. I have a second digital thermometer outside the tent with a temp probe inside at canopy height so I can check the temp without opening the tent. Each time I've checked it, the temp is a bit lower. Right now it's down to 79.9.

I'll keep checking throughout the rest of the day and check the night time max and min temps tomorrow morning.

I really appreciate everyone's help and input.

Thanks,

McT
McToker Reviewed by McToker on . Why do temps go up at night? I've searched and didn't find an answer. I have a Homebox S (31.5" x 31.5" x 63" - 6.89 sq. ft.). We have central A/C set on 76 F 24/7. I'm running 16 26 watt CFL's and 4 14 watters. The ocsillating fan runs in the box 24/7 as do the lights. The exhaust is handled by a 500CFM fan pulling through a DIY carbon filter. Our plants are still vegging so everything is on 24/0. During the day, the ambient temp inside the box runs from 81 to 84 degrees. At night, the inside temp will get up Rating: 5