Julian (Green Works) is a true problem solver, skilled in his profession, honest, very professional, efficient, knowledgeable, extremely intelligent, a thinker and above all, he has integrity. As I have found out repeatedly, mediocrity (at best) appears to be the norm in the HVAC world. Not so with Green Works. His price was reasonable but to be honest, no matter what the cost, I would and will have him return in a heartbeat. The work done and the problem solving was superb. Julian and his associate, Mario, performed the work at my place on February 3, 2017, on time and on the scheduled day. I had a new furnace (Lennox 96% efficiency) installed by another well-known HVAC company on August 6, 2016 replacing my 10-year-old 93% efficiency Goodman. I had used this company for the last 10 years for yearly maintenance and other things (not critical such as this) so they were quite familiar with my system. Per this company, I needed a $3000 dollar part or a new furnace would be $6800. The recommendation was made that I replace the furnace especially since I had just retired and wanted to keep future large expenses to a minimum. I will not bore the readers with the problems that I had with the first company. That will be covered in their review and is not relevant to the quality of work done by Julian and Green Works. However, I do need to explain briefly what happened with the initial installers and why I had to call in another HVAC company. Since Chicago had had a mild fall, I didn’t fully realize the implications of this installation until November. My bedroom is directly above the furnace/storage room. The furnace vibrated the entire room, so much so that one could actually see and feel the chair vibrating and feel the floor vibrating. I called in the installing company again. They tried various remedies to fix it with their final recommendation being that I needed to put in a new cold air return, at my cost ($1200) and perhaps even a canvas connector (approximately an additional $2000), none of which I needed with my other furnace. Their suggestions for repair were unacceptable due to the layout of my system and all of the extra costs. That was their “final offer”. Needless to say, I could not have this furnace continue to vibrate my 110-year-old building and supporting structures and I could not trust this company to “fix” a problem that they caused and were unwilling to take responsibility for. So I started educating myself and looking for someone who could perhaps fix the problem. The Lennox company was not very helpful. Basically, the Lennox furnace that was installed in my building was too powerful for the existing system and short of reinstalling another appropriately sized and brand of furnace, "band-aid" remedies had to be attempted. It is rather like taking two additional medications to correct the side effects of another medication you are taking. I just happen to find Green Works and Julian via Yelp and Angie’s list. Not only did he come out to the house, spend a whole hour with me diagnosing the issues, making viable suggestions that would work for my system but he also answered every last one of my questions via e-mail and phone. Julian gave it much thought but quickly came up with an innovative idea for a return installation that did not take up 12 feet of shelving and a file cabinet in the storage room which the first company had wanted to do. And, very important, the return did not cause unbearable noise in the family room as he insulated it and, as I said, had an thoughtful and innovative idea for installing it that prevented this problem. In fact, the noise from the new return was non-existent. There is more. The new cold air return did not totally stop the vibration. It greatly improved it but there was still a slight tremor. Remember, my concern about the vibration was the effect over time on the supporting structures of my building. The canvas connectors would eliminate the vibration but at a major cost. Julian came up with another idea that he thought might help and would only cost $200 at the most. It was worth a try. This was basically a “padding” at the top of the plenum. However, the furnace and plenum had been installed so tightly against the wood supports that he could not get the “padding” in. The good news is that by manipulating the metal on the plenum and loosening some attachments between the wood joists and the plenum (without compromising its integrity), he was able to eliminate the vibration in the room above it and hopefully on the building. He did not even charge me for this. He also made some other suggestions to increase the efficiency of the system which I have implemented. We both agreed to live with it as is for the next month to make sure that there were no other major issues with vibration. As I stated in the beginning, I will have Julian and Green Works back in a heartbeat. Julian and Mario were great and are good, honest and intelligent professionals.