No, they're double paned. They actually still do a pretty good job. Not worth replacing yet in my opinion.
I'm surprised to see that data you found. Although last year was an especially cold and snowy year here in St. Louis. I'm a teacher, and we had 13 snow days last year! A typical year gives us 5 or so. It was the coldest year I remember in quite some time.
Seeing as though my only year with heat pumps was uber cold, perhaps I shouldn't worry about it too much yet.
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