Three times last year, I ended up with a terrible sore throat and laryngitis. My doctor suggested doing something to help the indoor air quality in my home. I never thought the indoor air quality could affect my health so poorly. Since the air inside the house was dry and arid, it was having an adverse affect on my health. During the evening, I was sleeping with my mouth open. The dry air was irritating my throat and larynx. Even worse, the dry air was filled with contaminants that were causing me to get sick. I had to pay a specialist to examine my indoor air quality. They carefully examined every square inch of my home for problems. They found black mold inside my air ducting system, which was the likely cause for my distress. They performed a thorough cleaning of the air ducting system. They cleaned and sanitized each piece of air ducting equipment. They had a long brush that had an adjustable head. The brush cleaned every square inch of the air ducting system. I could see the brush moving in and out of the ductwork, because the crew used a special camera to view the interior areas of the ductwork. It was really interesting to see all of the weird and cool gadgets they used to clean the ductwork. There was no way I could have reached all of the crevices inside. They were able to clean every nook and cranny with those specialty tools. The indoor air quality in our home is much better now, thanks to the work of our HVAC team.