As a beginner I can only offer a few suggestions:

*rig a fan to some sort of exhaust duct, more advanced than what I have.

*lower your wattage (are you using more than 400w?) and/or switching to CFLs....

*add a portable air conditioner (kind of expensive)

*grow on 18/6 during the coolest hours of the day, overnight probably.


I'll have to defer to experts. good luck.