So the AC kicked on in the building Im working in...then a whistle starts and gets louder and louder. Sometimes because of the shape of the building the wind creates a vacuum on one side of the building but this is going on everywhere. The doors blew open near me and I literally couldn’t shut them. When I shut one (double doors with center bar) it would open the other. It was forcing the bar over. Still whistling like mad and its not that windy