R Value Of Triple Pane Windows

By increasing the r value from 3 to 5 average heat loss through the window is reduced by 30 percent to 40 percent designed for new construction and replacement projects the windows can achieve a u factor as low as 0 15.

R value of triple pane windows.

As a comparison energy star rated windows typically hold an r value of 3. The primary difference between double and triple pane windows is that triple pane windows are fabricated with three panes of glass instead of two. U factor measures the rate of heat loss expressed in btu hr ft2 f. All c o g u and r values are based on ashrea winter conditions.

For example if you pay 1 000 per year in energy bills have 20 windows in your house and 22 percent of your energy is lost through your windows which is average then each window is losing 11 worth of. The lower the number the better the glass. Windows in warm climates where cooling is the primary concern should have the low e coating on surface 2 as shown in the figure below. The technology behind window design has improved in leaps and bounds as manufacturers attempt to overcome the poor insulation value that windows traditionally offer the home builder.

While double pane windows are good in this respect the triple pane windows. From a cost standpoint it ll take a few decades to recoup the 10 to 15 percent upcharge to go from low e double glazed windows to triple glazed. The total heat transfer out of a window btu hr sq ft f or w sq m c. With that said we highly recommend double pane windows over single pane windows if you live in a colder climate.

If enhanced heat resistance is what you re going for then triple pane glass is a better choice. The thing is triple pane windows with their three panes of glass do a better job than double pane windows on preserving energy within your home. Double paned windows have an r value ranging from 3 to 3 7 according to the arizona public service co while triple paned windows have an r value of up to 5 making them more effective at. Framing cladding frame type and other items will affect the overall thermal values of a complete window.

A double pane window with a low e coating will have an r value equivalent to or better than a triple pane window. Triple pane and double pane windows cost. Triple pane windows energy ratings as r value for building materials. The lower the u factor the greater a window s resistance to heat loss which indicates better insulating properties.

But the third pane doesn t really make that dramatic of a difference. What is the advantage of triple pane windows as it relates to the r value. As a window s emissivity decreases its r value increases. This design increases the amount of insulating space so if you live in an area with very cold winters consider opting for triple pane windows to minimize heat loss through the windows during the chilly months of the year.