In this article, we’ll show you step by step how to remove the old sash from double-hung windows and mount either a new sash kit or a wood or vinyl replacement insert inside your existing window ...

They lose their seal and the argon gas (added between the two panes to minimize heat transfer) leaks out as the vinyl frames or ... loss through the glass. Window Inserts Fit Inside Existing ...

This is a much bigger and more complicated job than installing a vinyl window insert and may require a pro. If the frames are ...

Replacing aluminum inserts with composites. When vinyl windows reach a certain size threshold, vinyl frame and sash profiles require reinforcement in order to meet wind-load deflection requirements.

Vinyl windows make up the largest segment ... an insert lets in a bit less light than the original window. Inserts can be bought in stock sizes, but custom inserts offer more style and feature ...