A while back I posted about a whining noise that was coming from my new Trane XV95 furnace. The noise was very audible and present every time the blower motor ramped up and down. The noise was present in gas heat mode, HP and Cooling mode and all blower speed settings. After complaining about it to the installers and insisting on them contacting Trane to solve this problem they replaced the ECM motor, controller, and blower wheel this week. Problem solved, no more noise. The motor in question was a GE variable speed 3/4 hp and I believe it had a Gentac label on it. So, if anyone says "they all make that noise" don't believe it. Just thought I would follow-up on this so others may benefit.