The national average to replace old windows in a 10-window house with new vinyl double-hung, low-E (high efficiency) units can cost $5,600 to $10,300, with most people paying around $7,800, Fixr ...

An example of the vinyl double-hung windows made in Macon by YKK AP America, a subsidiary of Japan-based YKK Corporation of America. Special to The Telegraph. A residential window manufacturer in ...

Consider the historic double-hung window: two sashes glide effortlessly up and down, counterbalanced by iron weights attached to ropes strung through pulleys –– all hidden within walls.

These windows, original to my early 1980s house, are double-hung and framed in wood, with vinyl on the frame and a string-type mechanism. I cannot find any identifying marks.