Purchased Trane furance w/honeywell humdifer & central AC for a 3 unit small apartment builing, one per unit in late May 2007. This is the second winter, still experiencing problems. I have already replaced sensors on 2 units. Last night on the coldest day in Chicago, we had no heat. The units are vented directly off east exterior wall, my installer says that Trane has a malfuntion, and high winds it causes a backdraft into unit thus putting out the flame. I live in the Windy city. Last night the installer had to cut off the fresh air... read full review »