Are argon gas filled windows worth it?

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Tags

1. #dense
2. #there
3. #window
4. #found
5. #inert
6. #better
7. #insulating
8. #filled
9. #argon
10. #slightly
11. #rating
12. #atmosphere
13. #higher
14. #double
15. #because
16. #efficiency
17. #windows
18. #regular