My air handler sits on the ceiling joists right above my master bedroom. It is very noisy to say the least. There are no isolation pads underneath it either. I know adding pads under it will help reduce the noise, but I want to do it right. How much quieter would it be if I hung the unit from the roof rafters instead? There are no codes in my area, this is a stick built house circa 1978 w/2x6 rafters. If the improvement is minimal, I'll go with the pads, otherwise I don't mind putting the work in to hang it.