The Sunkool website lists 21 things they do for the "tuneup". One of them is that they "wash and wax the ourside unit". If the condenser coils are dirty, they need to be cleaned to maintain the efficiency of the unit. But you don't need an HVAC technician, just a garden hose, and maybe a coil cleaner solution. In my opinion, you are wasting money to hire a technician to do anything to a system that is operating properly.
You should add hot water to the condensate drain line every few months to prevent it from clogging. If you depend on a technician to do this annually, you are risking a clogged drain line. I would also suggest changing the filter every 3 to 6 months, not annually, especially if it gets dirty. I think that many HVAC companies make most of their profit perfoming unnecessary maintenance "tuneups". There is nothing that needs to be tuned up on an HVAC system. I have never paid an HVAC technician to do anything unless the system fails. They cannot prevent a failure with annual maintenance. Save your money.
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