We often see condensation and frost on windows, usually around the edges of window glass. The edge is where the panes of the sealed units are held apart by spacer bars.
Condensation is the primary reason for window-related call-backs. Non-conductive warm edge spacers reduce heat transmission of heat, limiting condensation. The material the spacer is made from affects the rate that heat travels through a window’s edge. Warm edge spacers can improve the U-value of a window by 10 percent, and boost the edge temperature by around 5°F, reducing condensation.