Historic window alternatives

I have a historic, (It was built in 1959 so it’ fifty years old), building that we are trying to do an energy upgrade on.
The existing windows are the old steel frames that were a standard for light commercial at that time.
Does anyone know of an energy efficient alternative that looks remotely close?
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Both
We need to do both as part of increasing the efficiency of the whole building. We will be adding 2X4s as furring on the inside and then doing spray foam before new drywall on the interior. The archeologists are concerned that changing to a different window style will significantly alter the appearance of the building, and its visual interaction with the other buildings on the compound.
i have no idea where to procure an energy efficient window that ugly.
alter the appearance of the building, and its visual interaction with the other buildings on the compound.
There is someone somewhere (an archeologist!!) that is worried those building have 'VISUAL INTERACTION"???!!! what a joke.
You already pretty much summed it up with your closing,
i have no idea where to procure an energy efficient window that ugly.
SO, my option: LEAVE the existing window as-is, add to teh existing 'ambience' by screwing sheets of polycarbonate to the outside of the block walls with a colorful matrix of serpentine caulking as a sealant to add to the visual impact, eh?
Yeah, the problem is that there's hardly anything you can do to that building (including demolition) which won't leave it looking better than now. Even windows from the guy on late-night TV would be too pretty.
Yep, even most of these have more visual appeal - and one or 2 may even be older?
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Your sheds?
Dude! You truly live in the wrong part of the country! You'd make any redneck or hillbilly proud to call you cuz'n! Shoot we could be related.
You parents from 'bama, Jawja, Ten-a-cee, West, by God, VA, or them parts?
Ah wudna' fit in, aint got no dawg.....
Dang, wen ah had my foot long red beard, folks in the hills did think ah wuz 'lated <G>
jigs
Narrowline casements with the same muntin bar location.
How much do you have to spend? A Google came up with St Cloud Window Company, which claims to do "historic steel windows". I suspect they may be a bit pricy, though.
Otherwise you could consider the laborious process of replacing the glass with double-pane panels, though of course the frames would still be as lousy as ever.
BF
Did you read the original post and perhaps take a look at the pictures?
I don't think they do that in China.