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The glass we use for our uPVC sash windows is a 24mm air-filled double glazed unit. As standard the unit will comprise of 4mm clear glass to the outside and 4mm Low E glass on the inside. The Low E glass is a special type of glass, which blocks out UV rays but still lets natural light enter. The Low E coating also reflects the warm air back into your room instead of allowing it to leak outside. You have the option of upgrading your glass unit to be argon gas-filled. With this upgrade the heat conductance between the panes will be reduced and your sash windows will achieve a superb energy rating of ‘A’. If you live in a noisy neighbourhood you also have the option of choosing acoustic laminated glass, which comes with a noise reducing interlayer to help keep your home nice and quiet