im seriously far from a pro when it comes to indoor. total noob to indoor. BUT I am more than experienced when it comes to growing weed outside. SO, my thoughts are that if a plant does really well outside, then by re-creating the same ambient conditions, you should have similar results. Outside in cali I get temps up too and above 100 F and my plants LOVE it. They absolutely thrive on hot summer days. This leads me to believe that everyone who thinks you need 70F is mistaken. In fact I have 3 babies right now inside that average well over 80F and they are growing extremely fast. I have heard that your temps can rise as long as the humidity rises as well. This leads us to your CO2. When using CO2 it tends to add humidity as well as heat. I think if you maintain 85F you should be fine, even 90F i think would work. My full size grow room is not operational yet because I dont have the plants to fill it up but dry runs are showing me that I will have temps right around 80-85. I am very happy with that. I say run it and see what happens, chances are that the people telling you that 85-90 is too hot has no actuall experience and they are only telling you what they read online.
