What is Low-E Coating?

Low-E (low-emissivity) coatings are thin, transparent layers of material that are applied to the surface of windows and other fenestration products to improve their energy efficiency. These coatings are designed to reflect heat and reduce the amount of heat that is transmitted through the window, which can help to reduce energy loss in buildings.

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Low-E coatings work by reflecting long-wavelength infrared energy, or heat, back towards its source, while allowing short-wavelength energy, or visible light, to pass through the window. This helps to keep the interior of a building warm in the winter and cool in the summer, reducing the need for heating and cooling systems to work as hard and saving energy in the process.

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There are several different types of Low-E coatings available, and they are designed to meet the specific needs of different climates and building types. Some Low-E coatings are more effective at blocking heat from the sun and are best suited for hot, sunny climates, while others are more effective at retaining heat and are better suited for cold climates.

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Low-E coatings are typically applied to the inside surface of a window, and they can be applied to a variety of window materials, including glass, plastic, and metal. Low-E coatings are an effective way to improve the energy efficiency of windows, and they are often used in combination with other energy-saving features, such as gas fills or multiple panes of glass, to further improve performance.

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In addition to improving energy efficiency, Low-E coatings can also offer other benefits, such as reducing glare and fading of interior furnishings caused by UV radiation. Low-E coatings are also relatively low maintenance, as they do not require regular cleaning or upkeep like other window treatments, such as blinds or shades.

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There are several ways to measure the performance of Low-E coatings, including the solar heat gain coefficient (SHGC), the visible transmittance (VT), and the U-factor. The SHGC measures the amount of solar energy that is transmitted through the window, with a lower SHGC indicating that the window is more effective at blocking heat from the sun. The VT measures the amount of visible light that is transmitted through the window, with a higher VT indicating that the window allows more light to pass through. The U-factor measures the amount of heat that is transmitted through the window, with a lower U-factor indicating that the window is more effective at retaining heat.

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Low-E coatings are widely used in residential, commercial, and industrial buildings, and they are an important component of many energy-efficient building designs. In addition to improving energy efficiency, Low-E coatings can also contribute to the overall comfort and livability of a building, as they help to regulate indoor temperatures and reduce glare.

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Overall, Low-E coatings are a simple and effective way to improve the energy efficiency of windows and other fenestration products, and they are an important consideration for anyone looking to reduce energy use and save money on energy costs.