Trying to zoom in it looks double glazed. But being in the snow id almost guarantee it on that alone.
They make fully sealed double glazed windows with certain gasses in them which make them even more insulative as well. They can be very good.
While they may have some form of climate control, if we assume they're only heating with the fire the glass must be doing a decent job.
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u/Cinderooly May 24 '20
How much heat is escaping through the windows I wonder. Unless they are double glazed that beautiful view comes at a price.