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Triple Pane Windows

Triple pane windows offer excellent thermal performance at a price. The biggest question for most homeowners is is it worth the cost? Let's explore this question in more detail.

For additional pricing, check out our replacement window calculator and get project costs.


Basics

Triple pane windows are pretty straightforward - instead of a single pane or double pane windows, they use three separate panes of glass. There are two basic designs, one is thinner - as if you took a normal double pane window and slid another sheet of glass between the two. Here you would use a krypton gas fill and low-e glass coating for a very efficient glass system. The second design is thicker - as if you took a double pane window and added another whole section to it, making it a relatively bulky IGU or insulated glass unit. Here you would opt for the cheaper argon fill and the low-e glass coating on all the panes.


Costs

While the cost of a triple pane window will depend on many factors (brand, model, frame material, hardware, additional upgrades and type of installation), the actual upgrade from a double pane to triple pane will typically run $75 to $125 per window. Get complete replacement windows cost by manufacturer here.


Advantages

Triple pane windows offer better thermal performance to be sure. This means more energy efficiency, which in turn means lower energy bills and a more comfortable home in both summer and winter. However, a triple pane window that uses clear glass will underperform a double pane window that uses a low-e glass. So for most homeowners it only makes sense to do the triple pane if you are using good fills and low-e glass on all panes, which is an expensive upgrade.


Disadvantages

Certainly cost has to play a factor here. Adding $100 to each window is a major expense. The other consideration is the extra weight of the third sheet of glass. This can put an additional strain on the hardware and cause it to wear out more quickly. This is especially true with doors and casements. The other point to make is that triple pane windows inlcude an extra spacer, gas fill, seals and glazing - effectively multiplying the number of parts that can fail on a window down the road.









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