Performed 2 A/C tune ups. Both system electrically are running with in specs. Up stairs system has high static which you are aware of. Systems do not have any surge protection or wet switch’s. Both systems do not have any IAQ. Down stairs system has a 4†filter cabinet with 1†filter in it. 4†filters are good for 6 months and 1†filters need to be replaced once a month. Recommend running 4†filter in downstairs system. You are up for renewal on tunes ups. Systems are both up and running when I left.