I live in a converted warehouse and the windows are over 100 years old. Rolled metal frame with single pane windows, in a brick wall. They are quite drafty and have poor sound insulation. You can see the windows in this photo
We have custom powered shades that roll down and fill the window frame (they are up in this photo).
I'm trying to think through the best way to insulate them from the interior for the winter - ideally something I can remove for the warmer months to maintain the view and use of the pivot window in the center.
Historic building so we can't change the design of the windows. We must maintain the facade of he building that includes the window design.
The windows are 17x7.5ft and 15x7.5ft. The large size makes it near impossible to find off the shelf solutions, so it will need to be custom.
I used Frost King (https://www.homedepot.com/p/Frost-King-Indoor-Window-Insulation-Kit-3-per-Pack-V73-3H/100135637) last year, which was a pain to install given the size of the windows, and having to stitch together two sheets per window. They worked somewhat but were more a headache and eyesore than the bit of draft they blocked.
Restoration of these windows is very costly and ideally I can push that cost out for a few more years. Plus we are on the 4th floor above a major street, so any exterior work will have more challenges.
I live in Northern Georgia. I've talked to neighbors and some have put up heavy blackout curtains to block the wind and temp loss, others have caulked all parts of their window and made them unable to open. the rest just deal with the draftiness.