How can I tell if I have argon-filled windows? How can I tell if I have argon-filled windows?

There is no specific test you can do to determine whether you have argon filled windows. However, you could try looking at the spacer between the window panes. If you can see a plug there, you probably have argon filled windows. To put argon in between the windows, the company has to drill a hole in the spacer and then pump the argon in. After they add the argon, they have to plug up the hole. If you see a plug, you should have argon. 

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