I don't pay any company for HVAC maintenance because I don't think a technician can do anything to predict or to prevent a failure. The homeowner should pour hot water down the condensate drain every few months to ensure that the drain is working properly, inspect the coils for dirt and debris, and replace the filter at least every 6 months. Most HVAC companies make more money on preventative maintenance agreements than on repairs and replacements.
I would suggest reading the 21-point "tune-up" tasks on the SunKool website. Based on the OP's post, it would interesting if someone would accompany a SunKool technician during a tune-up and require that he perform all 21 tasks that you are paying for. I don't think there is any way that he can perform those tasks 8 times per day. A single tune-up should take at least an hour or longer, plus travel time.
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