From all the companies and manufacturers that i have seen/read. Double pane with Argon is an R-4 value and Triple is an R-8.
The big difference is the heat and cold - it is incredible not to feel any cold on these windows. These windows are made to deflect the cold in the winter and the heat in the summer. Also, from our purchase from double to triple panes (all low e argon) for the entire house, was $800 - which was literally nothing compared to how much the whole house cost.
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