 If something goes wrong, it's a machine, stuff can happen. Maybe there's a freon leak. It could be anything, any number of things. They'll come out ASAP, no waiting. They will dispatch somebody in your direction. You'll get a discount on parts and labor, too, for any repair that might be needed. But generally, when you have good ongoing maintenance, you don't have to worry about major repairs. That's another reason to spend the $180. You'll get it back on lowered electric costs, like me.