The danger of relying on AC is if the power goes out your birds are in a heap of trouble because they are not acclimated to the heat.
My birds handle the heat pretty well. They are Black Javas that have been bred in this area for several years, so they deal well with the heat and whatever diseases are endemic to the area. My coop/runs are well ventilated, with the south side being open hardware cloth (some are partially shaded with shade cloth - depends on how much other shade is available) and numerous large hardware cloth covered vent areas around the top of the remainig sides. My coop/runs are deep enough that there is some shade available all day long, all year long.
Shade is critical. Water is critical. I give my birds a large black rubber bowl of water to stand in when it is really hot. When it is hot and dry I also spray down a portion of their run each day. I stop spraying when the humidity kicks up. My birds have much more trouble with the humidity than the heat in the summer.
Everyone has their own management technique. I won't keep birds that can't handle the heat. My power goes out several times a month in the summer.