Rob was friendly, patient and professional with our "singing frog" furnace that would sometimes blow cold air in the middle of the night but would work fine when someone came to look at it. At first, the problem seemed to be that the furnace was overheating because of the filter, which as clueless new home owners we hadn't been cleaning/replacing; Rob moved the wires that had been installed (by a different company) in a way that blocked us from accessing the filter, we replaced the filter and the furnace worked fine. When the problem persisted days later, Rob came back out right away and found the root of the problem. He always returned my calls promptly, showed up on time and took off his shoes when he came in the house. I will definitely use this company again!