My plant completely dried out. [Pictures] HELP

CO2 combined with higher temps can be effective, but you will have to be much more exacting with water, humidity, nutrients, etc.

CO2 is not a simple fix for high temps.

IMO, if you keep starting over and can't manage to keep temps under control, you are not ready for CO2.

Yes circulation is key! Good airflow coming in and steady airflow coming out. I get nervous when my temps hit the low 80's. I start opening windows fresh air into the room. This is in the day when my lights are on, maybe 80-83. At night I drop down 75 or so when the lights click off.