I have never paid anything for maintenance. I add a gallon of hot tap water to the condensate drain about every months, change the filter every 6 months, and hose off the condenser unit when needed. I think maintenance is the biggest money maker for most HVAC companies. They get paid for whatever they do, and they don't need to fix anything. Also, they don't provide any guarantees for future service or repairs or extended equipment life. Their "verbal" promise to provide priority service or to extend the life of your system is not worth anything to me.
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