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The procedure is to knock out the inner pane with a hammer and some kind of chisel or limited travel punch being careful not to crack the outer pane. The only advantage is insulation between the two and ever then, I think it is hardly measurable. Maybe a degree or too but when it gets that cold....you will likely have other issues to consider. I had a 76 and the best trick is to duck tape the entire inner pane first so the glass doesn't shatter everywhere when you punch it. It was somewhere in the late 70's that they changed to single pane I think, and they are still available if you should break both panes on accident but a "pane" in the ass to change out so be carefull.
Randy
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