Condensation happens when the temperature of an external glass surface on windows or doors is lower than the dew point (temperature where water vapors begin to liquefy) in the outside air which is 65 to 75 degrees in Southern regions. Winter condensation occurs when the inside surface of the glass is cooler than the dew point temperature within the home.
*The region you live in.
*The number and types of glass units in the home.
*The type of double glazing system on the glass units.
As a result, it may be challenging to tackle condensation due to these factors within different homes. Three product options to eliminate condensation is Argon-gas-filled units, warm edge technology and Low-E glass.
In order to stabilize air flow between the panes of glass units, a gas must be used that is slow-moving, less penetrable, and reduces heat transfer between the inside and outside. The overall performance of Argon gas meets these needs. Once this gas is installed and sealed into a window, it is denser than regular air, and has an optimal spacing of about 11-13mm or 1/2 inch.
Warm Edge Technology
The biggest downside of Argon-filled glass units is that they perform better in colder parts of the country than they do in warmer regions. Warm edge products are designed to reduce condensation as well as energy loss for homeowners. “Warm edge” refers to the construction materials on the edge of a double glazed unit that transfers less heat or cold than conventional construction double glazed units or standard aluminum spacers in windows.
Many homeowners are unaware that condensation and energy loss are related, and up to 80% of energy is lost via the glass’ edge. Double glazed windows fitted with warm edge spacer tube can help reduce condensation on your sealed glass unit by up to 70%. Warm edge also significantly reduces the difference in temperature between the edge and center of the glass unit and up to a 94% reduced thermal loss at the external edge. The most innovative warm edge spacers can contract and expand due to fluctuating temperatures without losing its original structure.
Low-E glass is designed to absorb radiant heat (IR light). There are various grades or types of Low E glass: pyrolytic, sputtered, soft-coat, hard-coat and solar selective. The performance of Low E film also depends on how it is positioned in the glass unit.
A Low-E coating on a glass unit has a tendency to warm the inside surface in the winter, and the external surface from the sunlight in summertime. It will also reduce the external surface temperature at night. Although their is increased potential of more condensation forming in the summertime due to the Low-E film, it is still a good product overall to prevent condensation, UV damage, and reduce energy loss overall. As an extra incentive, homeowners purchasing Low-E glass units are also eligible for energy rebates.