Low E Glass Windows

What Is Low-E Windows?

A low-E window is a glass with an invisible metallic layer, only several atoms in thickness, that is applied to its surfaces. It allows short-wave solar energy to pass while bouncing back out long-wave infrared energy. This ensures that most of the sun’s energy will enter into your home while only aloowing minimal amount of heat in your house escape. This is especially beneficial in colder climates as it significantly reduces heat loss from your home in the winter time. Though there is a slight loss in solar heat gain in your home with the presence of low-E, it more than makes up by significantly reducing solar heat loss in the nighttime.

There are three main applications of Low-E coatings for residential windows:

LoE 180 – With a glass U-Factor of just 0.26 and an SHGC of 0.69, Low-E 180 Glass is an excellent basic product for passive solar applications. By blocking heat loss to the outside of the glass, the high solar gain glass keeps homes warm in winter and cool in summer.

LoE 272 – Low-E 272 Glass delivers year-round comfort, reflecting an intermediate level of heat back into the room in winter and rejecting the sun’s heat and uv rays in summer. This product’s patented coating provides clarity and high-performance low-solar control, reducing window heat gain by 50% compared to ordinary glass.

LoE 366 – The ultimate performance glass, Low-E 366 provides the highest levels of year-round comfort and greatest energy savings. Its patented coating offers an ideal balance of solar control and high visibility. Blocking up to 95% of the sun’s damaging rays, Low-E 366 glass sets a new standard in energy performance.

Although historically Low-E coating was applied in a “soft-coat”(low heat loss, low solar gain) and “hard-coat” (moderate heat loss, high solar gain), recent developments in technology are erasing the differences between the different low-E applications.

While it is good to choose an energy-efficient product from the start, it is easy to optimize your window replacement by selecting low-E properties for your exact needs. Windows that face south or east can maximize the passive solar energy intake with high solar gain low-E. Conversely, you may want to have a low solar gain glazing on west-facing windows as it often helps keep the room cooler in the summertime. Low solar gain coating is also good for north facing windows as it allows for the least amount of heat loss in windows that get minimal sunlight.

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