Andrew Gabriel wrote:
In article ,
Ian Stirling writes:
Ken wrote:
Any suggestions for overcoming misted sealed units, is it possible to drill
hole and allow it to dry out?

Drill two holes on the outside. (~5mm)
Diamond grit bit in a dremel or something.

At this point you may blow through with some fan, taped to the window.
it'll take a few hours to clear.

Now, make 2cm*2cm squares of glass, and silicone round the top three edges,
leaving a gap of some 1mm and covering the hole.

This should stay clear almost all the time.

Trouble is, by the time it mists up, the desiccant all round the
separator has already expired. Just drying the air alone isn't
going to help for long as it will mist as soon as any more moisture
gets in (or temperature drops below dew point). I don't know what
desiccant is used, but maybe gently heating that also to drive off
some moisture so it can work again would get you a bit more time.

No.
The idea is to vent it to the outside.
I may not have made this quite clear.
If you do this, then it is less likely to mist over - as unless it's foggy,
the air outside is always at a humidity under 100%.
As in most cases, the outside pane will be slightly warmer than the
external air, it's therefore not going to be able to condense, if the
vents are of adequate size.