Accumulation of dust in home since installation of gas furnace and central AC
We had a Carrier gas furnace and a central AC unit installed in about 2000. The contractor told us that the Honeywell high-density media filter we had was much less efficient than the electrostatic filter he marketed, and because we have pets and allergies we went for it. After the installation we had the ductwork cleaned and we were looking forward to much cleaner air in the house, but that was not to be. We began to notice an accumulation of greyish, lint-like dust throughout the house so we contacted the contractor about the issue. His first fix was to install a small media filter ahead of the electrostatic filter, but it was so loose in the housing we noticed that particulate could get around it unimpeded. When we told him that there was no improvement he suggested that the clothes dryer (located within 5-6 feet of the furnace) was likely leaking lint into the basement and the furnace was picking it up and recirculating it. We dutifully purchased a new washer and dryer and installed new dryer ductwork making sure that every seam was wrapped with silver duct tape. The problem continued. In desperation I asked the contractor to remove the electrostatic filter and replace it with another high-density media filter, and to his credit he did so. When that showed no improvement he reinstalled the electrostatic filter and we are back to square one.
We have had the ductwork cleaned twice since the installation - once conventionally and once by an "eco-friendly" scam that apparently provided their own evidence of what they were removing from our ducts. In 2009 we had all our windows replaced with vinyl sash windows, partly because the old windows were inefficient single pane and also because the sashes leaked badly. Nobody seems to be abe to point us in the right direction and I am ready to pull my hair out.