Hello, having a ceiling fan on is fine to move the air around the room, it is not recommended to have a fan blowing directly onto your birds. You can place a towel or thin sheet over the top and sides of the cage this will help keep the direct draft of them, if it is extremely hot and your birds are sitting with the wings slightly away from their bodies this means they are hot. You can offer them a bath with room temperature water in it, or use a misting bottle to lightly mist them.