Vacuum glass is a great option for heritage window renovation and restoration because it is narrower, lighter, and more efficient than traditional double-glazed windows. Tempered vacuum glass has all the air extracted from the cavity between the two panes, which creates a vacuum chamber that prevents almost all transfers except for radiation. This makes it an excellent choice for heritage window renovation as it can help to maintain the original appearance of the building while improving its energy efficiency. It also offers several other benefits such as reducing noise pollution and condensation and improving indoor air quality.