I disagree but i do agree that the recirc button should never be lit. Always on fresh air. The air con acts as a dehumidifier. It cools the air to remove moisture, is below it's dew point, then the air is reheated so it has less percentage saturation. I'm not going to get into a debate about it, a/c when on heat mode does not cool the windscreen, if a/c is on cooling will cool the windscreen. I could talk about it all day as it's my profession but I don't feel the need to.