I was absolutely confused when I started getting all this dust building up around my household, i always changed the air filters plus I even used the high quality air filters. I also had a powerful whole-house air purifier in my home, so I didn’t understand where all the dust was coming from; When I had my sister over at my cabin 1 morning, she was shocked by the awful air quality, but she asked myself and others when I changed my air filter last plus I told him it was recent. She particularly had to check the air filter to think myself and others plus then she saw the air filter absolutely was fresh, and then she said it was likely the ductwork, however so both of us peeked in 1 of the HVAC vents plus sure enough, it was dirty as ever inside the ductwork! She then said that entirely was the problem plus I would have to contact the HVAC contractor to have my ductwork cleaned out. I asked him if I could just vacuum everything out on my own, however my sister explained that you particularly need special tools to properly wipe out the ductwork system plus the HVAC servicemans entirely knew what they were doing. She figured it was possible to do the job on my own even though I wouldn’t get all the dirt that was trapped inside the ductwork. So I just provided in plus called up the HVAC contractor plus had them wipe everything out from the ductwork. I even saw the before plus after pictures plus it made myself and others guess sick how nasty the ductwork was. I guess sometime down the road I will want to invest in a ductless HVAC system.