Double Pane Low E Windows U Value

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.

Double pane low e windows u value.

Additionally the window selection tool compares average simulated energy costs for your location based on various window types. Very low emissivity windows offer the best improvement you can obtain in window insulating performance. Gases are heavier than air and therefore provide insulation resistance to air. 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.

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. 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. Some triple pane windows may have a u factor as low as 0 15.

Are triple pane windows the best. Double paned windows may have a u factor at or below 0 30. 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. Triple pane windows work best when enhanced energy performance is a key objective.

Low u factors are most important in heating dominated climates although they are also beneficial in cooling dominated climates.