I'd definitely take a look at your intake. Didn't notice any specs on that, but it sounds like it isn't cutting it. If you are like me... during "daytime" you check on those babies ALL THE FLIPPING TIME. This creates a serious change in airflow which will, most likely, keep your daytime temps controllable. I would guess that if you went without checking on them... you would notice that low 90's temp during the day as well. Even if you open up and look twice a "day"... that is (insert time of visitation) minutes that you have open/free air flowing. When you sleep and the plants are still chillin' in "daytime"... that is (insert time of sleepings :hippy hours of ininterrupted airflow... allowing heat to build up. Those precious visits during the day probably remove a great deal of that stored heat.

And 20 CFL's??? Holy shiiiip :stoned:

P.S. Take a picture of your set-up. We like pictures :jointsmile:
TheMetal1 Reviewed by TheMetal1 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