Windows in Charleston are often older wood sash on Kanawha Valley houses, drafty in a West Virginia winter and damp on the side that faces the hill. Single glass gaps. The uphill windows stay wet. The street side takes grit and wind funneling along the river. Fogged newer units in later parts of town are a different repair from a rotten sill on an East End or West Side house. Say which you have.
Soft wood at the stool means the wall has been taking water, which happens where the hill sheds onto the back of the house. A new pane will not cure that. Cords fail. Sash painted shut is common in houses that have been weathered for a long time. Lower windows near a retaining wall or a sloping yard take splash. Describe the floor and whether the opening is buried against the grade.
Valley humidity fogs bath windows and feeds rot even when the temperature is mild. A hard freeze still finds the gap and the draft. Houses stepping up South Hills may have a whole wall of glass toward the view and a nearly blank wall into the hill. Those are different jobs. Say if you want old trim kept, and say if paint on the sash will be disturbed.
You do not need every opening counted. Weather side, uphill side, or the whole house is enough. This is Charleston in the Kanawha Valley, not a coastal porch city. Ice, coal-dust grit on the sills if that is what you see, and shade are the local wear. Screens and locks matter only when they are the failure you are calling about.
Check the lower rail. Windows in Charleston fail on older valley houses where hill damp, river wind, and a real winter meet. Call the number on this page.