Last few grows they were coping at 36-38c it gets very warm anyway with the CO2, but I didn't use it after week 5-6 of flower because its a proper fuckpig trying to keep the RH down, sweats like a prozzies minge on a friday darn chappytown! Plus the smell got too bad at some point, a badly balanced air flow due to temps n RH imo, plus an old carbon filter etc, but the end result was mega yields in DWC. This time I'm all new for the first time in 7 years and the plants are only seedlings still under 600 MH so they are ok for the time being... I inherited some kit of my brother, and included is a blue angel? Haven't tried it yet like!