All of the windows in our house are double-glazed, except for one that I installed last summer, it is triple-glazed. When the outside temperature gets to -15°C (5°F) frost starts to form around the edges of the double-glazed windows (photo on left). The colder it gets, the more frost forms along the edges. In our current cold spell the outside temperature is more than -30°C (-22°) and you can see the frost that has formed on the double-glazed window. The window on the right is our triple-glazed window, whose photo I took at the same time as the double-glazed one. It is frost free, except for just a bit in the corner.
It would be nice to have all triple-glazed glass in the house, but it is very expensive. The small triple-glazed window I bought for the bathroom that came with a screen and opener, cost $800. As nice as it would be to have all triple-glaze, it would be terribly expensive to replace all of the windows in the house.
View my paintings at: davidmarchant2.ca