We bought new in 2006. The Trane AC was installed by Sunkool. And the AC had an extended warrantee of 5 years as part of the sell price of the house. Sunkool initially tried to sell me this coverage but checked the records and found that it was already covered. I would expect that the Trane AC warranty was only one year. Note that the extended warranty required that I pay for a yearly checkup. That may be a clue as to whether you have an extended warranty.
Your best bet is to call your AC installer and ask them. After 5 years I renewed the warranty and had to pay about $1000 for years 6 thru 10.
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