35 C in Grow room :(

I'm in a similar situation with temps, not quite as high as what yours are but I have had grows that hit them temps. The only thing I found to combat the heat is not growing inside through the summer, which I have failed to do this year so I'm battling temps now. So long as you have enough extraction and a decent amount of wind blowing on them then that should help. Unless you want to pay a fortune for Ac then that would help bring temps down. My work around at the moment for summer is were I draw the air in from. My lung room (room tents in) may hit 38c when outside temps hit 30c and when this happens I use ducting to extend the air in port, I'll then place that in an open window. So instead of the tent drawing in 38c heat it's only drawing in 30c heat. Then then power used for lighting warms the 30c to about 34c instead of 38c to 42c. By reducing power of your light and reducing your light cycle will help. I'm about to dim mine a little to help and may even reduce my flower period to 11hrs.