U.S. Department of Energy Energy Efficiency & Renewable Energy U.S. Department of Energy Energy Efficiency & Renewable Energy

Improving Window Performance

Question: 

Which of the following options would NOT improve the performance of a window?

     (a) Increase airtightness of a window

     (b) Increase the number of glass panes.

 (c) Increase the thermal performance of the window frame.

 (d) Increase the thickness of glass.