Double Pane Low E Windows U Value

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.

Double pane low e windows u value.

Triple glazed windows may have a u factor as low as 0 15. 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. The more panes the better right.

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. Additionally the window selection tool compares average simulated energy costs for your location based on various window types. Some triple pane windows may have a u factor as low as 0 15. Triple pane windows work best when enhanced energy performance is a key objective.

The best high performance double pane windows may have a u factor of 0 30 or lower indicating that they are very energy efficient. Energy star provides recommended u factors for your climate. Double paned windows may have a u factor at or below 0 30. 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.

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