Argon/Krypton Gas insulation
I recently started researching windows and was wondering how much of a difference it would make to have argon gas or argon/krypton gases or just air between the panes. I live in a moderate climate.
I'd also like to know how well do the gases keep their insulation value? I mean, do the gases escape? If I spent more money on windows with the gases, would it be a waste of money in a couple years? Would significant rainfall affect the windows' ability to keep their seal, thus allowing whatever's between the panes to escape?