yes the heat as been a big thing took alot of working out geting fresh air from one place and removeing hot air in a diferrent place even when the lights go off now it stops @ a nice 70f being off in the day .i did have a 3rd 600 watt in there but took it out same day because it took the temp up to 80 f even with a cool shade . i have 6 inch removeing hot air from cool tube a 5 inch puting air back in and a 6inch takeing air out cut down with to half out put ,two fans set 2 temp 25c and c02 only set for lights on ,just fed my plants bud blood never done this before hope it works.will ad pic when i can