With the gas inside of the window compromised, the window will no longer be as well insulated against the outside temperature. Even if you don’t notice condensation inside your window, you can use a thermal imaging tool, and this will show you where there are differences in temperature, which either means that the seal has failed, or you have some other leak that is causing a temperature difference.
These seals will break over time due to the way the gas expands and contracts when heated up and cooled down. Naturally, better quality windows will last longer.
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