I have two separate water furnace systems (one upstairs and one downstairs) in my home in central tx. We've been dealing with mold issues on the fans, inside the handler, and in the ducting coming out of the handler. I've been researching some air purifiers that are placed both outside the intake and in the ducting itself, but I'm not finding a lot of info on them. Does anyone have any suggestions on a good way to combat the mold issues inside the ducting? Thanks!