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Triple Glazed Windows Compared to Double Glazed Windows

Triple Glazing Corner Cut Out

There are triple glazed windows out there that are less energy efficient than double glazed windows, this all depends on how the window is manufactured and the quality of materials used. The first thing to get familiar with when buying windows is U-Values and the energy rating system. The minimum regulation requirement is a C rated double glazed window which has a U-Value of about 1.7, then a B rated window with a U-Value of around 1.6, A rated which is the highest in double glazing usually has a U-Value of 1.4 and currently what most window companies are offering in triple glazing in the UK is around a U-Value of 1.0. The thing to bear in mind is that the lower the U-Value the better the window is in regards to energy efficiency and sound proofing. The U-Values I have mentioned are just averages and they may vary from one company to another, this is down to manufacturing methods, glass quality and the quality of plastic used.  Double glazing alone can save the average household about two-thirds of a tonne (680kg) of CO2 a year, however compared to triple glazing it is considerably more. A triple glazed window which is manufactured correctly using high quality materials can achieve a U-Value as low as 0.7, which has been widely available in many European countries for many years. Triple glazing is becoming more and more popular in the UK as energy bills continue to rise and higher taxes loom for less energy efficient homes.

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