Is that the only space you have available for a theater? Above the garage? I ask because I did the same thing, in Michigan, and temperature swings were ungodly. I can't imagine how hot it might get for you in TX in that room. Are you planning on doing a proper load calc for the room?
My bonus room was added a couple years after my house was finished so I really couldn't plan the HVAC for it.
My build thread:
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