How do you know if you have Triple Pane?

This is how you can tell if you really have triple pane

In an industry rife with cost cutting, sometimes contractors use a “bait and switch” technique — especially if the uninformed homeowner would never know the difference.

Here’s the way to tell if you really have a triple pane window or not.

Hold up a lighter to the window.  If you see three distinct reflections, you have triple pane.  If you only have two, you have double pane.