I contracted with spectrum air, fort myers, to install a new trane xl20i complete system on may 21, 2012. I also bought a 12-yr extended warranty (parts and labor) at the time from you, through spectrum. Installation was without problems. Within days I asked spectrum to come back out and see why there was a loud buzz-hum coming from the unit. They found no problem. This noise issue was assessed several times over the past 5 years, with the same conclusion from spectrum — no problem. They could not diagnose a problem and they never offered to replace the defective compressor. Warranty problem Because my neighbors (and we) were getting fed-up with the noise after several years, my only remaining option was to have another certified trane specialist look at it. I called the bruno air people who came out and investigated the unit. They found that the hi-stage compressor was drawing 12.5 amps, more than the 5.5 amps for the unit. They suggested that I get it replaced under warranty because running at that level would contaminate the refrigerant and damage the system. Trane agreed with the diagnosis and approved the replacement per their parts warranty. I agreed to have bruno make the replacement but was informed that my extended warranty from trane would not cover the $1950.00 labor costs because the work had to be done by the original installer. I had to pay out-of-pocket to replace the original bad compressor. A few months later the coil needed to be replaced, costing me another $2000 in labor costs, not to mention the money I spent for the original warranty! Working with the trane warranty company was torturous as they would not follow-up with promises to resolve the issue. I'm out about $4000 in labor costs that should have been covered by the labor warranty!