I had a Carrier contractor for 8 years and it was starting to cost money. I thought I would end the hassle by buying the very best I could buy and of course the Trane name came up. I contacted the maintenance company I was with for some years and the sales person came out. I guess I was an easy sell for the XL19i as I wanted the best and was willing to pay for it! I got it with all the bells and whistles. I expected this ultra high tech piece of machinery would and could last the rest of my life considering I had basic Carriers that lasted 25 years where I live in the Phoenix area where it is as hot as it can get. While the problems started from the beginning with the installers not being able to get the unit started for 3 days I knew this might not be as great as I thought. Things seemed to be going fine for 3 years until one day the unit was blowing hot air and the tech who came out said the compressors were gone and had to be replaced. Well they couldn't get any for 4 days so I had to stay in a motel and then when they did get the compressors in they couldn't get the house any cooler than 80. My normal daytime temperature was 78. They didn't seem to know what to do so they just started replacing parts and some of them were major parts. This was done at no charge as part of my contract. Well it took 3 weeks to finally get the unit to get to 78 after they replace a major unit in the attic where the second part of the HVAC unit is located. I won't get into part names as for the purposes of this it doesn't matter. It was at that time I learned that I was sold one of the last units that used the R22 Freon and that by law those units could no longer be made as of 2010! I was also told that the government would allow the chemical companies to still make the environmental unfriendly R22 until 2020 but it was going to get very expensive and the parts for any of the R22 units from any company might no longer be available. I was not told at the time of purchase by the dealer or by Trane that I was buying an obsolete unit and the ramifications of this. So anyway, they got the unit to run at 78 again, at least if it went on very early in the morning, as once it got to the heat of the hot summer day it would not go down any further, just hold that temperature but run a lot. This was crazy but they didn't know how to fix it and Trane was totally unresponsive. I filed a Better Business Bureau case against them and the dealer. Trane never did come to the house but reviewed a report and said they felt the unit was fine, it was that the copper tubing was 7/8" and they wanted 1 1/8" tubing which meant they would have had to tear into my house walls to replace the tubing. That is total bs as I have many neighbors who have changed out their AC and every one of them got the system working fine with the tubing that came with the house. This was later clarified when I pressed Trane that since my tubing run was only 35 feet the 7/8" was fine. This has been a particularly brutal summer and I like to work out in the house and of course you sweat and that cool air coming in isn't comfortable but I can't turn up the unit for an hour or so to shower as it won't go back down again. The unit runs constantly trying to go down but doesn't until the sun goes down. Obviously there is something still very wrong. The dealer has sent 3 service people out and they took all of their measurements about static pressures, CFMs, bla bla bla and when the "expert" came in he said he didn't even have to go look as he knew the problem was that my ducting needed to be changed. The unit was too strong for the duct work and the airflow wasn't proper. Of course I asked, well when and before they sold me the unit why the house was not surveyed to see if the ducting was proper for the new unit they were selling me versus maybe a smaller unit going in. He just said, well, sales people aren't trained for that so they sold me what I wanted!! It was a pretty half ass answer but it was true! Most of these dealers could care less except to sell you something even it wasn't right for the house. And I still don't believe him, by the way. But, if it were true the salesperson would have had to tell me that in addition to the $12,000 I paid for the unit there would be another $6,000 for ducting and that may have/would have blown the deal. Now the service "expert" says the only way to get it straight is to change all the ducting for $6,000 and then check the unit again as it may have been "stressed" by the lack of proper airflow so parts may have to be changed, including the compressors. Then of course it is only a small amount of time and I will need a new unit that takes the A410 gas versus the R22 I was sold so I might as well get ahead of the curve and get it now. He thinks if I get another unit with the ducting I can get a nice rebate for the old one! More bs! I am going to have another more reputable dealer come out, at least by the BBB standards and by word of mouth, to give my ducting a complete technical review and see where things really lie. What a mess, and I thought I was solving all my problems by buying the best. I guess when it comes to AC things are in their own bubble! Doubt if I will ever buy Trane again just based on the fact that I was not informed of the obsolete model I was buying and what it meant in the future!!! Bad business!