I have seen multiple ads on the Television for window replacements, you might try looking for reviews of these companies. No a word of caution, I tried this back of North, the companies I contacted all were doing the same type installation: cutout old window AT THE INSIDE WALL EDGE, install new window in the resulting opening (NOTE: the actual glass area will be several percent smaller since the new window is set into the FINISHED wall NOT the ROUGH opening, then install mullion on the outside of the house to cover any openings. I was not happy at all with this approach, and the several thousand dollar cost estimates. I did my own (stick house, aluminum siding) and by making small adjustments in the window size I was able to use STANDARD size windows, the result was a savings over over $5000.
I wish you luck on your quest.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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