I just installed a new Carrier air handler in my attic and I am suprised at the amount of compressor noise that comes from the line set. It is a 3 1/2 ton unit with 3/4 line set, insulated and about 40' long. It runs through the rim joist at the first floor level and up in an exterior wall through 2 more layers of 2x4 plates to the attic. There are 2 90 degree fiitings in the 3/4 line and the 3/8 line was bent with a tubing bender so there are no kinks. I have not over strapped the line set so that is not the problem (vibration transfer to the house structure). The lines are fire caulked at the wall plates. There is a filter/dryer with the arrow poiting toward the air handler in the attic (16" away).
Anyone have any ideas? Is there such a thing as an expansion tank like gizmo to reduce the compressor noise?