[A/S] foggy windows

[a9464@xxxxxxxxxxx]

It is my understanding from the people who build thermopane windows 
that they are void, or simply put, there is a vacumm between the 
glasses. It is not as simple as pumping out the air. A special 
factory process keeps the interior space moisture free. Otherwise 
they would fog during certain weather conditions. I don't think any 
of us can duplicate the process outside of the factory. Every few 
years one of the windows in my house will fog and it has to be 
replaced. They provide them free under warranty and never want the 
bad one returned. Going to a single pane is the answer. About half of 
those in my 78 are single and are nice and clear. The remainder will 
be soon. Good luck...... Arnie