It is not only the summer noise. At least in my case, the power quality is worse in the summer. All summer I have had to endure a persistent and loud buzzing from my system. It is so loud I really can't listen to it during the day. And no, it is not a "ground" problem. From the hours of 2:00 AM to 5:00 AM my system is dead quite. It is also quite though the rest of the year.
I hate summer!
I hate summer!