Q: how do triple-glazed windows work in the summer with air-conditioning? Which companies make these?

A: Triple-glazed windows keep the heat in in winter and the heat out in summer. You need them year round. I bought my triple-glazed windows from Lowen, Sierra Pacific and bought triple-glazed glass panels (that were installed by a carpenter in places where we had only a panel of glass that did not open) from a local glass supplier.