My old furnance and AC were nearly 20 years old. When the compressor went, we decided to replace rather than repair. I got multiple quotes from different people and Boris was by far the most professional and informative person I dealt with. He took his time examining the current state of things and sat down with me for 30 minutes or so to explain the ins and outs of how heating and cooling work in a residential home, and what the different options were for my house (we went with a 2 ton AC and 60k BTU modulating furnance). (The other people I spoke with spent about 5 minutes with me, and didn't even tell me basic things like the size of the furnance or AC without prompting.) After we decided to go ahead, Boris was able to schedule the work for a few days later.
His crew (2 guys) showed up on time and were also very professional. The very first thing they did was laid down some drop sheets to protect our floors - something many contractors do NOT do. They told me at the start the work would take about 7 hours - and completed it in almost exactly that amount of time. When it was done, they explained the ins and outs of the new thermostat, filters, and that I needed to keep the existing humidistat fully on all the time (because the thermostat has a separate control for it).
I can't recommend Cozy World enough. Everyone I worked with was very friendly, professional, and happy to answer every question I had.