The saying, even doctors need doctors, became tplot when I started our first task. I remember that afternoon appreciate it was Last week. It started as a sunny, laid-back afternoon. There were not a lot of calls coming in or any previously tied up tasks. Being a fairly recruit, I was going through the manual for the multiple processes such as duct cleaning. Being a local business, all of us had well-functioning heat & AC products because all of us took the respected service of the systems. The two of us boasted of the high air quality that all of us enjoyed each time all of us came to the office. Around midday, all of us heard a loud rumbling noise then after a few hours, the heat pump restarted on its own. The two of us noticed that the quality of the air had deteriorated within an hour. The head of the apprentice program at the company saw a good learning opportunity for the trainees including me. She took us to the basement where the air purification plan is located & supervised each step all of us took to repair the media air cleaner. A few of us were assigned the process of inspecting the interior of the system. I was responsible for duct sealing the air duct. After sealing the air ducts, all of us removed the washable filters then reinstalled them. She would ask us to explain each step to see our level of understanding about air quality systems! Cleaning the air filters was key to maintaining indoor comfort, and lastly, all of us noticed that the thermostat was not working, however it only needed new batteries. It was such an insightful experience that assured me of our mastery of this equipment. To our surprise, our director rated our input on the issue & the scores would influence the overall scores for the apprentice program.