I found this company on the Lennox website. They came up as a "Premier" Lennox Company with "quality installations". We set a date. The Central Air Systems crew of 5 showed up and it was obvious that they were not the advertised uniformed factory trained service technicians . There were no uniforms, they seemed more like day laborers and they brought nothing with them they had to ask me for drinks, so they obviously didn t know they were working until the last minute. The entire installation only took them one day, about 7 hours. Three days later with only the fan on, I found black particles of debris spewing out of both of my bedroom registers, landing on my dresser, bed etc... They came back and replaced one duct completely and half of another duct since he "couldn t get to the whole thing". Apparently, replacing a 3-ton system with a 4-ton system creates more air flow and subsequently starts clearing out any debris in the vents that had been there since 1990 (incredibly, he told me they were mouse droppings). A week later, I went into the attic space myself to find pink duct insulation sticking out -- I could easily feel the plastic on the inside. On others, the 2 inch silver Venture tape had already come off. The tape holding the duct attached to the air intake was also loose I could easily move it with one hand. I also cleaned out a bucketful of pieces of plastic pipe, copper pipe, nails, wrappers, a cardboard box etc Then I put back the pink insulation that had been moved. At this point, I sat down and wrote an email to Barry Gross, the President of Central Air Systems Inc. Three days later, Central Air Systems came back to fix the tape problems and check for crimping. The next day, April 22, I decided to run a test of the system myself. I turned on both the fan and compressor and went into the attic space to check for leaks. Much to my dismay, there were several leaks. However, the worst one was from a collar that actually extended below the unit basically I was now cooling my attic. Please note that it was not my job to be in the attic space checking on what was supposed to be a quality installation by this company they never tested the system for leaks at any time. Three days later, at my request, they had Mastic Sealant with them and sealed everything. I was told not to turn on the system for 24 hours and they never came back to check it. My driveway is at an angle. They leveled the plastic pad under the compressor on 2 pieces of slate (from my driveway) and a piece of wood -- no one knows if it is even treated. So, I have someone coming in the fall to build a brick foundation for it. This technician trained at Robbins, the first company who did an outstanding installation job in 1990. After going through the attic he simply said, This is definitely not a Robbins Installation. He knew immediately that it had been a rush job and said he never could have done this in a day. What a shame , he said. Buyer Beware.