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2 votes

How can I determine the U-value (or R-value) of my existing double glazing system?

My challenge was slightly different. I was purchasing new NorthStar windows to replace all of the old windows in my house but wanted to make sure I was getting what I paid for, as the windows would ...
  • 21
2 votes

What is the most efficient disposition of windows to prevent thermal loss and improve lighting?

There are whole books on passive design. Lawrence Livermore has a simulation program that can help with design. Some quickies: for a south facing window, triple pane is net lower than double pane. ...
1 vote

What is the most efficient disposition of windows to prevent thermal loss and improve lighting?

This depends primarily on whether you're in a heating or cooling climate. In many places you want to heat the house in winter but cool it in summer, but people also live where they almost always want ...
  • 3,792
1 vote

What's the optimal glass separation for secondary glazing?

1/4 to 3/8 inch. Smaller spaces than this means fewer collision between gas molecules so heat transfers faster. Larger spaces than this allow convection cells to form. For residential use, lean ...

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