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The U-Value of the glass refers to how well it prevents heat being radiated outside. The lower the value, the better. To put the values into perspective, single-glazed glass has a typical u-value of 5.6, ordinary double-glazing is between 2.8 and 3.5, double-glazing with low-emissivity glass is around 1.8, and the low-emissivity glass with argon has in the gap is around 1.6.