What is Solar Pumping?

Solar Pumping heats the inner airspace of the window and causes the window to pressurize. Small amounts of air within the window are pushed through the semi-permeable seal. In the evening as the temperature drops the window cools and creates a low pressure area causing small amounts of air to be drawn back into the inner window cavity. The air being drawn back into the window naturally holds moisture and this moisture is absorbed by the windows descant material.

Day after day, year after year, this endless cycle of expansion and contraction occurs. The window literally acts like a pump, stressing the integrity of the seals and drawing air through the side. With that inflow of air comes moisture. Temperature inside can easily reach 170° during the Solar Pumping process and at that temperature failure is eight times more likely to occur.