Double Pane Low E Windows U Value

Very low emissivity windows offer the best improvement you can obtain in window insulating performance.

Double pane low e windows u value.

The more panes the better right. Are triple pane windows the best. Low e windows have u value and emissivity values that range from 0 02 to 0 20 which means that 80 to 98 of the room s heat is reflected back into the room in the winter. Low u factors are most important in heating dominated climates although they are also beneficial in cooling dominated climates.

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. The best high performance double pane windows may have a u factor of 0 30 or lower indicating that they are very energy efficient. Some triple pane windows may have a u factor as low as 0 15.

Additionally the window selection tool compares average simulated energy costs for your location based on various window types. Double paned windows may have a u factor at or below 0 30. For most energy efficient windows the u factor for the entire window assembly is higher than the u factor at the center of the glass. Triple glazed windows may have a u factor as low as 0 15.

Gases are heavier than air and therefore provide insulation resistance to air.