One of the ac units in my firm went out in the middle of the summer. I called Stan's Heating and Air Conditioning to have two of the units replaced. While they were here they also did some duct work. Overall it was a pretty big job. Apparently they do not do a lot of commercial work, but the tech was able to figure out the rules and regulations pretty quickly. I liked the guy that I worked with. He was prompt, professional, and quick. The work was expensive, but I was satisfied. It was a good experience and the units have been working okay.