Bought this unit in April 2015 to replace a 20-year-old Lennox system. The Lennox, in the last 5 years of owning it, needed capacitors, a fan motor, a control board and leaks patched in the evaporator. After spending $700 in repairs I wasn't going to spend another $1,000 on a new evaporator and more expensive r22. I don't have complaints about the Lennox, I think I got more than my money's worth on it. My hvac guy put in the Lennox and I would have gone with another one (glad I didn't) but he no longer sells that brand. He sells Armstrong Air and Trane now. I really wasn't hung up on a particular brand but I didn't know anything about Armstrong Air so I went with Trane. Couldn't be happier with my decision. The Trane XR14 combined with the all aluminum evaporator and the XV80 furnace work flawlessly. My old Lennox was mostly trouble free for 15 years and worked well but not like the Trane. Although they are both 3.5 ton units the Lennox would run non-stop from noon until sundown to maintain 75 during the hottest part of summer. When it got really hot (>100) and humid it couldn't maintain 75 and the temperature would go up to 78-80 degrees. It has always been like this even when it was brand new. The Trane has no trouble maintaining 75 even when the outside temperature is over 100. Even on those days it cycles about twice an hour and doesn't run non-stop. Trane is not kidding when they say their all-aluminum coil is better at heat transfer than traditional aluminum fin copper tubing condensers. Even though it's only 1 year old it has worked flawlessly since it's first start up. I think most people who have problems with a new system of any brand are not matching all the components and getting a bad install. When I bought the Lennox it was to replace a Carrier condenser that needed 2 compressors and numerous repairs in 10 years and never cooled well. The A/C guy I hired to replace the Carrier said that it was slightly undersized at 3 tons but most of the problems I was having was that it was a new condenser connected to a 14 year old Fedders evaporator and furnace. Nothing was wrong with Carrier as a brand. He stressed you should always match the condenser with a new evaporator and air handler/furnace. Saving money by keeping your old furnace/air handler because it's working fine will cost you dearly down the road. Rheem, Carrier, Trane, Goodman etc. engineer and test their equipment to work with their own evaporators and air handlers. Putting your brand new Trane A/C with your old Carrier air handler will probably cause problems. For example, he said Trane evaporators are taller than evaporators from most other brands and Trane only makes 1 type of A coil. Some installers will put in a different brand or a N coil if there is a problem with clearance instead of redoing the plenum to fit the Trane evaporator. Something this minor could cause problems a few years down the road.