If you have old, drafty, and inefficient single- or double-hung windows, you may be able to replace them without completely tearing out the frames and preparing a new rough opening. Instead, you may be able to install a sash replacement kit in the existing frame. These kits allow you to change an unsightly or poorly insulating sash window relatively easily. You can order a number of standardized sizes and styles that fit most frames.

Sash replacement kits come with all necessary hardware and instructions. Basically, this is how they work:

1. You remove the old stops and the existing window from the frame and take up all the jamb hardware.

2. You fasten metal brackets, spacing them evenly along both sides of the window, and then install new jamb hardware for the replacement sash.