Probably the absolute best way to design a room, (at least for cooling purposes) (though not always achievable), is to seal your air cooled hoods and cool them with passing intake air and exhausted without ever coming in contact with the grow room air. This in itself will lower the ambient temp at least by 10 degrees. But as I said, not always achievable, especially if you're running multiple lights or banks thereof.
But hey...what do I know...
I've tried this before to be fair I found it's near than impossible to do it successfully with air cooled hoods it always created a vacuum which means it was always pulling air out the room ... Probably do able with a lot of patence
Peace