Double Pane Low E Windows U Factor

The best high performance double pane windows may have a u factor of 0 30 or lower indicating that they are very energy efficient.

Double pane low e windows u factor.

A virtually invisible low e coating is applied to the glass to help reflect heat and keep your home comfortable. Energy efficient windows use two or three panes of glass to slow conduction and maintain comfort. Low e coatings usually applied to the inside layers of insulating glass manage the amount of light and heat either conducted through a window or reflected away from it. Triple pane windows work best when enhanced energy performance is a key objective.

Double pane dual pane glass naturally performs better than single pane glass for energy efficiency as the space between each pane acts as an additional layer of insulation from the heat or cold. For most energy efficient windows the whole window u factor is higher than the center of glass u factor. Double pane windows are low e coated to produce a high medium or low shg factor. Low e glass is optimal for conserving energy because it reduces ultraviolet uv and infrared light penetration to limit heat transfer.

Our interior surface low e is engineered to have a lower u factor and is applied to the interior surface of the glass providing increased comfort and improved energy savings. It s a durable tco transparent conductive oxide coating that enhances the u factor of the window by reflecting heat back into the home. Triple glazed windows may have a u factor as low as 0 15. The more panes the better right.

As with moderate solar gain low e glass these windows are often referred to as spectrally selective low e glass due to their ability to reduce solar heat gain while retaining high visible transmittance. Double glazed low solar gain low e glass. Manufacturers have started to incorporate low emittance coatings and gas fills between panes in attempts to further decrease u factors and provide an. This figure illustrates the characteristics of a typical double glazed window with a low solar gain low e glass with argon gas fill.

Choose to add optional argon gas between the panes to act like an insulating blanket and reduce heat transfer. Low u factors are most important in heating dominated climates although they are also beneficial. The u factor will approach the very low 0 15 point if there is a gas such as argon or krypton between the layers of glass glazing. High performance double pane windows can have u factors of 0 30 or lower while some triple pane windows can achieve u factors as low as 0 15.

Some triple pane windows may have a u factor as low as 0 15. Gases are heavier than air and therefore provide insulation resistance to air. Are triple pane windows the best. 4th surface 4th surface turns double pane windows into triple pane performers.

For example double pane high solar gain low e glass is used in heating dominated climates such as areas in the northeast and midwest medium solar gain low e glass is used in the midwest where there s a need for both heating and cooling and low solar gain low e.