[expat2]

And vice versa. If the frames are metal, double panes will not help.
That’s why I said you were both right.

[Harmless Teddy Bear]

Metal can work if it is handled properly. Like with the glass you need a gap between the two sides of the frame that is filled with a low conductive material.

And, of course, everything has to be set in properly so there are no leaks.