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15 votes
5 answers
28k views

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

Is there an easy way to determine the U-value (or R-value) of an existing fitted double glazing system? Two options spring to mind, looking up the value in some kind of database (sadly I have no idea ...
Mark Booth's user avatar
  • 1,652
7 votes
3 answers
3k views

Is secondary triple glazing a practical way to reduce energy costs?

I have been considering installing secondary double glazing units in my home in an attempt to turn my double glazed windows into triple glazed windows. I understand the law of diminishing returns, ...
Mark Booth's user avatar
  • 1,652