Window refurbishing companies?

Does anyone know of any companies or handymen who refurbish windows?  My sliding windows are worn, does not slide smoothly, and are drafty.  I could only find companies that replace windows, but not refurbish windows.  If anyone has any info, I'd really appreciate it.

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RE:

If you have wood windows, I have talked to folks at John Staton Windows, Kinney Woodworks, and the Window Shop.  The person from the Window Shop flat out refused to wear a mask for a brief assessment of our home, which I found unprofessional.  Staton and Kinney came back with high estimates; I haven't actually worked with them yet but am still considering it.