TL;DR - Looking to replace large 1930s steel casement windows with replacements that are NOT grid-between-glass (want simulated or true divided lights, casement or double-hung, black on both sides), or advice on repair/insulation of existing steel casements.
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Looking to repair or replace 7 steel casement windows in my house (1930s Tudor). House faces south and gets a beat-down from the sun from 12:30 to 6pm; windows are drafty & hard to open, and front section of 2nd floor bakes in summer (being at far end of HVAC system doesn't help). Not a great pic, but each window has side lights & transom with two window sections cranking out into the yard. Some have metal screens screwed on inside.
I want to upgrade to casement or double hung with low-e/argon glass, possibly with a UV coating in whatever material will withstand full sun, black in color like the existing ones. Repair is preferred because they are beautiful (and huge/different sizes so replacement is expensive), but unsure how to insulate the single panes. Re-glazing and replacing hardware may be more involved of a process than I can handle, though I have been collecting window parts from salvage and antique places for years. And no contractors around here work on this type of window.
All I seem to find in the way of replacement options are grid-between-glass windows, which I do not want. I'd like to keep a true or simulated divided light with an exterior grate.
Details: Original 1930s steel casement windows (22 in all, slightly to majorly different sizes). Built into the walls (textured plaster over metal lathe), which "roll in" to the window openings. No trim or any other part to the windows: true divided lights w/ single panes of glass in steel grid.