Also, many of us bought 10 yr extended warranty on the Trane heat and A/C units and at least one of the major companies (Munns) requires an annual checkup to keep the warranty in effect. Not sure if that is a Trane requirement or the company with whom you purchased the warranty. But, like iaudit said, it gets so much use that I feel the need to get it checked out. Never did this regularly with my heat pump "up North".
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Maryland (DC Suburbs) - first 51 years 
The Villages - next 51 years 
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