[Talewinds]

We just did it in October. We tried to maintain some of that history by leaving the 1873 wavy glass on the front facade of the house after I replaced some cracked panes, glaze, paint.
But we had 23 other windows replaced with the dual pane argon yada yada, the window company was able to replicate the non-standard single vertical center mullion in the 82X30 windows.
That's 393sq ft of thin, brittle, single pane glass and VERY drafty sashes replaced. Needless to say we did have considerable lower gas bills this year, even though we had much lower average temperatures. Throw in the tax credit and it was worth it.