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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
Which make and model A/Cs do you have here?
Do you have return air grills in the center of the ceiling or not?
I can tell you that none of the vents should be closed. If you restrict the air flow it won't cool as well. Are you running them on "Hi Cool" or not?
Just checking back in to see if perhaps you may have missed by earlier responses to your question? Easy to do considering the volume of e-mail that most of us get every day. If you need me to resend this information please let me know. Thanks!