I have never paid anyone to service my HVAC system. I think that the only things you can do to prevent a failure or to extend the life of your system are to replace the filter, add vinegar or flush out the condensate line, and make sure the outside unit coils do not get dirty. Do these things yourself on a regular basis, and there is no need to pay an HVAC technician to come to your house for a "tune up" or whatever service they call it.
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