[bluGill]

Problem is most of them are paid for by the seller who doesn't care about customer service. If your HVAC really was bad they will replace it when they must, but their incentive is to do the cheap repairs as long as possible, instead of the expensive do it right: hoping that eventually you give up and replace it yourself.

If people regularly paid for the yearly subscription they would have incentive to service the customer, but this would increase their costs and most people are not willing to pay the true yearly costs.