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Alpen Windows is your source of high quality, energy efficient windows in a variety of frame materials. Each Alpen window uses Heat MirrorĀ®, a low-emissivity, coated film suspended inside an insulating glass unit. A range of Heat MirrorĀ® products can reduce heat from the sun and increase window insulation. The two airspaces created by the suspended the film further increase the window's R-value.