The technicians arrived right on time and got right to work. They answered all of the questions that I had, and provided detailed pamphlets for additional services offered without any hard sell tactics. After I showed them where all the vents and cold air returns were, they completed the project in a timely manner without any additional help required, as any true professional should. The floors were covered with mats before they laid down there vacuum hoses to protect the entire pathway to the furnace area. Before and after pictures were provided to show the amount of work that had been done, and provided certain suggestions to maintain my HVAC efficiency. I would recommend Safety King to anyone that wants reliable, timely service. 5 stars all day.