A-1 Worcester Air's Warranty is as follows:

Trane's  products must be registered to receive the following warranties, else the base warranty is 5 years.

According to July 1993 issue of 'Consumer's Reports,' TRANE has the fewest 'in warranty' breakdowns.
There has been a more recent Consumer Reports article relating to their 2000 questionnaire.
For more information click on the link below:

Most any contractor can offer an extended warranty in the form of an insurance policy. I don't know about you, but I hate dealing with insurance companies. If a system breaks down there is an insurance claim to be processed. 

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