They were there for 15 minutes and they never opened or took any vent covers off. They used a small vacuum to clean a few vents. Then they told me my main line needed work and that would be $119. I tried to call Nellie at the office as she is a supervisor to talk about my experience with Guy, the technician, and he hung up the phone on me and Nellie has not called me back after promising that she would. They also called me 2 hours before my appointment and told me they were ready to do it and if I couldn't accommodate them they would make me reschedule.