I found J&S online and had them clean my furnace (at the reasonable cost of $99). In doing so, Brandon the technician recommended fixing the secondary heat exchanger which was leaking. In the time between the cleaning and the repair, about two weeks, the furnace stopped working. Skeptical that somehow the cleaning led to this problem, I called J&S to come check it out. As I hovered over poor Brandon as he assessed the situation, I came to learn that my skepticism was completely unwarranted. The furnace quitting on me was genuinely unrelated to the cleaning. Throughout the ensuing repairs, Brandon took the time to thoroughly explain what was wrong and how he was fixing it. In a day and age where you never know if a trade is being fair to you, I felt extremely confident in the work that Brandon had done both on the cleaning and the repair. While it is rare that I take the time to commend good service, I feel compelled to do so this time because I think that others will benefit from my experience. I plan to continue using J&S for my heating/cooling service needs.