Growing indoors, in hot weather is a major challenge. I don't even attempt it. I only grow in the fall/winter/spring.

I used my house ac/heating system to supply my small piss-ant grow room with fresh air, too. I just opened a window in front of the intake of my central air system. All air in my grow room, came from this source. It supplied the fresh air, added heat when necessary, added RH when necessary and added cooling when necessary.

Your #1 objective is to maintain: 70-85 degrees between the canopy and the lights and 40-60% humidity. IMO.