Sierra will not quote any price without having their technician diagnose the problem. They charge $75 for a diagnosis.
They improperly installed my system only 4 years ago. Their improper installation led to the failure of the compressor on my A/C unit, yet they will not quote a price for a warranty repair unless I pay them $75 to diagnose it. I told their representative exactly what the problem was, and exactly the service that I wanted them to perform, yet they insist on having their technician look at it before quoting a price. Even though they installed the system, they will not waive the $75 fee.