The temperatures in the cold corridor began slowly to rise. So it was time that we closed the cold corridor, meaning that we place roofs and doors to keep the cold air trapped in front of the servers.
This helped a lot and the temperatures began to drop in front of the racks. Unfortunately we noticed that our current AC unit was not able to produce enough pressure to get the cold air all to the top of the racks. Meaning that the upper sections of the racks was not getting enough cold air and was hotter then the middle and lower sections. We decided to place a order for a new unit, which should arrive in 1 to 2 months.