What is the difference in Window Sash replacement units?

Q. What is the difference in Double Hung Window Sash replacement units?

Q. Do I need to replace both sashes on my double-hung window units?

A.We offer you the options of TOP SASH only, BOTTOM SASH or Both. With glass .. or without glass - it all depends on your needs.

See at: http://www.biltbestwindowparts.com/catalog/2