Defogging

The sun creates pressure by heating up the window in the daytime, and when night falls, the process is reversed due to the cooler temperatures. This causes what is referred to as a pumping action. After several years, the seal on the window is broken and moisture seeps in, fogging up the window between the two thermal panes.

When a window fogs up, it no longer has an R-value insulation rating. A thermal insulation window derives its thermal pane value from a 95% dry air space.

Defogging is simple, effective and reliable. Technicians will drill two holes (1/8" diameter) in one upper and one lower corner of the window to create a chimney effect.

The window is cleaned using a special solution to remove the moisture and any dirt that may have infiltrated along with the moisture. Then, defogging automatically takes place, removing the fog through the vent valve located at the top of the window.

As soon as the fog is removed, your window will regain its original thermal insulation rating and its R-value, as the dry air space is restored.