If I could give ZERO stars I would!
Called for their AC tune-up special that is running on the radio.
One of the questions they ask when you set the appointment is whether or not you have a home warranty.
IF you say yes, they will NOT service your AC.
My home warranty company requires that I get the unit serviced annually. They do NOT offer this service and state that I can use any licensed AC company.
So the only reason I can think of is that an owner would be less likely to use them to fix the "extra items" discovered during the tune-up! Can you say Possible Rip Off?