This is what I wrote to Trane: Dear Mr. Michel, Just a few years ago we purchased a top of the line home a/c unit, the Trane XL19i including the air handler and Clean Air Effects. Over the last three and a half years we have had nothing but trouble with our new Trane xli-19. From a broken heater element in the winter, to numerous replacement of the air cleaner, from leaking refrigerant to a replaced condenser. This is the just summary, we've endured 3 years of malfunctioning equipment, right from the day we purchased it, all the way through now, with a leaking unit that does not cool that well. As of now, the unit is still not working well and is literally taped up with duct tape by the installer. It is too late for us, we purchased the complete new system, now over 3 years ago, and are stuck with expensive repairs each time it fails. But I want you to know how the systems you are selling are not as good as you advertise. 'Nothing can stop a Trane'?, Well ours stops frequently. Also, the 'licensed and official' dealers who install them do not know your equipment well, and on numerous occasions have demonstrated that they cannot properly diagnose or repair the Trane XLI-19i. I have printed out the manuals many times and shown the installers on how some of the parts should work. So, as said, all I can do is make you aware of this and post my experiences online as much as possible, so that others do not make the same mistakes we have made. In short, below are only some of the issues we have had: ' From day 1, the clean air effect was not installed properly, never worked. Installation company was not aware, did not know how to wire it. ' Emails to Trane went unanswered on multiple issues. ' Unit was rewired 6 months later. Now properly wired, still not cleaning air. ' Heat coil broke, called in for service requesting it to be replaced. Installer came, did not bring coil. Diagnosed: coil broken and had to come back with coil. Came back with wrong coil. Fixed after 10 days in the cold. ' Unit malfunctioning: clean air effects error lights. Months of hassle with the installer, all they could do in the end is replace some parts and tape the unit shut with duct tape. Problem not fixed. ' Condenser frozen, unit not cooling. Added refrigerant. ' Leak detected in condenser, replaced whole condenser at my expense. ' Unit still leaking on the outside and inside. During the first 3 years, the company that installed the unit, All Year Cooling and Heating, did a terrible job. They not only installed the unit wrong, they never repaired the unit fully. Their service is of the lowest level. Most recently our unit has been serviced and repaired by CMi a/c & Electrical in Lake Park fl, who has done a better job. Of course they billed us for the repairs and service, as they should, but for a high end unit that is fairly new, one would not have expected these kind of repairs. I have not included the many service bills or receipts in this letter. With the model and serial numbers and the information on the installation and the service company you can do some research on the many issues your products have. Per the many service people and per the various posts in the forums, your a/c units are breaking down more than other brands. With the exception of the initial 'repairs', we have faced several expensive bills for repairs, in both refrigerant and labor. So, in conclusion, the Trane a/c unit has been a very bad and expensive choice.