Boarding a train every morning is part of my routine every working day. It also meant avoiding the morning traffic on the roads. People on the train tend to keep to themselves, most of them on the phone, others reading the newspaper or books and so on. On this particular day, there was a turn of events. One of the passengers commented on the rise of uncertified technicians. Another chipped in by saying that he found out that a used washable filter replaced the old filter. He only realized this when it was time to clean it. Another saw an ad on the street called a heating provider for a furnace/heater tune-up. He did not bother checking the heating corp online. Later on, when he checked it out, he found it, but it had only two reviews; both were negative. The guy had not done any maintenance, and the only thing he did was seal some leaks in the ductwork, which was also poorly done. He made it worse because he tampered with one of the joints in the HVAC duct, and his guest bedroom was not receiving any heat from the boiler installation. There were also some positive stories for those who contacted a certified home services company. One said that her energy bill had been so high. When she called them to check it out, the HVAC repairman fixed the gas furnace the gas fireplace, and they also gave her energy-saving help tips to keep the energy consumption low. After the duct cleaning, indoor air quality improved tremendously. Her whole-home heating system has never had any issues since then.