Jim Cox writes:
"The soil where I live is like adobe, and I have two dogs who bring in dust so fine that it passes right through vacuum bags, let alone normal furnace filters, and used to collect heavily on TV and computer screens by electrostatic attraction. Last fall I installed an Aprilaire 5000 with a condensing furnace and have recently noticed that the air in the house is so clean that there is no longer any dust at all being deposited on those screens. Good job."