My new Trane replaced an old 10 seer Lenox heat pump. It is not obnoxious, but I expected it to be quiet. When outside, it seems no louder than any other heat pump, maybe even quieter. But the deep tone of the fan seems to resonate off of the corner wall that it is against and the result is that I can hear it come on when I am in the house. It is on the ground and my condo is on the second floor. I assume there really is nothing I can do, correct? It is not bad, but it almost sounds like a helicopter in the far far distance. I think the problem is that the sound has a lot of bass and therefore travels.