Interesting read. It's funny how many methods I've heard for demisting windows - everyone seems to have a different opinion on whether you should have your aircon on or off, whether temp should be ramped up to max, or set lower and whether you should open windows or keep them closed.SRGTD wrote: ↑Fri Nov 30, 2018 11:31 am From a current post on seatcupra.net forum on misting-up windows at this time of year - thanks to forum member andycupra on seatcupra.net;
Now understand that as air cools its capability to hold moisture reduces.. so if the air at 20 degrees has relative humidity level of say 75%, as the temperature cools overnight the relative humidity figures increases until you reach the dew point. - you tend to get more moisture form on the windows are these are the coldest bits.. (notice how headlights mist up when washing the car? - on that note if you get this issue and use a hair dryer to remove the moisture you must run the dryer on cold and remove the warm air)
Now, this time of year, its wet, its cold, you wear a coat... you breathe... this all means that the air within a car tends to have high relative humidity as you introduce moisture and ramp up the temperature...
So the good news is you can do somethings to help. - for example, in addition to fixing any leaks and removing wet items, plan ahead, and by that i mean, as you approach your destination, try and get the relative humidity down in the car. So hold your breath..
Other ways to reduce the humidity may be to turn off the heater and open the windows to get some air changes through the car and hopefully reduce the humidity. - and/or run the air con to use the dehumidifying affects, but for this to work well you need to run the temperature lower.
and don't forget to do the windows up again! - hopefully this will reduce the build up.
The bad news.. is that moisture and misting up is a natural phenomenon all cars suffer, although the differing levels. Thickness of the glass, how air tight the car is, or is not... how wet the seats got when you sat on them with you wet jacket..
I am currently experimenting with the method below, which seems to work well for me so far, but conflicts in many areas with the post you quoted
https://www.youtube.com/watch?v=qCmgWiEEZwA