Originally Posted by retiredguy123 (Post 1641862)

I've never had a maintenance contract or service. I change the filters myself, make sure the condensate drain is dripping, and that the outside unit coils are not dirty. These are very simple DIY tasks. If the system stops working, I have it repaired. I don't think there is anything an HVAC technician can do to predict or prevent a breakdown, or to extend the life of your system.