one way is to vent it , another is cfl , a combination of all these would be the best to me , u can get cfls and use hps for 6 hours somewhere on the middle opf the day , the temps dont affect that much the flower its self as the temps in a bright light day of august under the sun may reach 50c its the roots that need to be in excact temps so to have best floral production (22-28) , try making the intake of the venting at the bottom so to let the soil chill before fresh air gets heated