I just had a new Comp Roof installed on my home, I also had a new Heating and Air Conditioning unit installed on the roof.
When I started using the Air Conditioning I noticed that it made a loud hum when it started up then it got down to a low hum. I thought that this might be normal cause my home is very small anyway so the unit isn't far away.
Anyway the loud hum started getting quieter and when it did I noticed that the Sheet Rock in the master bedroom ceiling is cracking, And the crack started in the area where they installed the new Air unit. I have called the installer to come out and check it out but he hasn't showed up yet. Has anybody else ever had this problem,