Double Pane Low E Windows U Value

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

Double pane low e windows u value. 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. 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. Energy star provides recommended u factors for your climate. Very low emissivity windows offer the best improvement you can obtain in window insulating performance.

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. Triple pane windows work best when enhanced energy performance is a key objective. Are triple pane windows the best. 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.

Triple glazed windows may have a u factor as low as 0 15. Double paned windows may have a u factor at or below 0 30. Low u factors are most important in heating dominated climates although they are also beneficial in cooling dominated climates. 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.

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