• Energy ratings: triple glazed windows are usually rated based on their U value and SHGC.  A good triple glazed window should have an approximate U value of U-0.13 to U-0.18 along with an SHGC of 0.60 to 0.65.
• Frame material:  the material you choose for the frame is very important. Firstly, triple glazed windows are much heavier than double glazed and the frame needs to be able to support this weight for years without warping.  Secondly, some materials are more energy efficient than others. PVC frames are another option for a frame material, however, they may sag over time.  Frames can be built using a steel or aluminium reinforcement, but this usually reduces the energy efficiency of the window.
• Spacers: the most commonly used spacers are: single seal spacer, the cheapest option, this does not provide very good insulation. Warm edge spacer: provides good insulation from weather and temperature changes. Premium super spacer: made to resist UV light oxidation, it provides high energy efficiency and durability.
• Gas filling:  triple glazed windows are three panes of glass with a space between each one, each of these spaces is filled with a gas, some are more energy efficient than others. The most common gases used to increase energy efficiency are Krypton and Argon. Argon is the cheaper of the two options, the density of Argon is heavier than air which creates good thermal efficiency.  Krypton is the more expensive choice, though it is a better insulator as it works by filling the small air gaps which makes is a much more effective insulator. Above all else, make sure you buy your windows and have them installed from and by a professional, this can have a massive impact on how energy efficient they are and how long they last.

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