I have used Wm. Henderson Plumbing, Heating & Cooling Inc. for a couple of years, and they do a good job for me. They just came here a few days ago to clean the system. They usually send out the same guy each time, so that is nice. I get to know him, and he gets to know the system. He is friendly, and shows up on time, and does good work. He takes the time to explain things to me, what he is doing and what it costs, and I really appreciate that! Overall, I would rate them Four and Half Stars out of Five!