How can Low- E Windows help you reduce energy?
Low-E (low emissivity) glass helps keep your home warm in the winter and cool in the summer. During warmer months, Low-E repels the UV rays that cause excess heat, keeping your home more comfortable. When it gets cold out, Low-E absorbs UV rays, keeping your home nice and warm even during the chilliest months of the year.
Low- E Windows create an insulating airspace that reduces both conductive and convective heat loss. The addition of a durable, transparent, low-emissivity (Low-E) coating to the glass reduces radioactive heat loss, while permitting solar radiation to pass through the glass. This combination of attributes creates passive solar gain, which is beneficial in colder climates.
Low- E Windows also reduce air infiltration and leakage through and around the existing windows. Low-E Windows have undergone the most field testing of all window attachment types. Field test results indicate that adding Low-E storm windows can generate significant energy savings for single-family and multifamily homes. Further, energy modeling suggests that a Low-E storm window upgrade also offers a relatively short payback period when installed over clear-glass, double-pane, metal frame windows.
Three types of Low- E Windows
Low-E 180 (passive solar heat gain)
Low-E 180 glass keeps your house warm in the winter. Install Low-E 180 glass on east-facing windows if you want heat gain in the morning, such as in a bedroom or breakfast nook.
Low-E 272 (reduce heat gain)
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 coating provides clarity and high-performance low-solar control, reducing window heat gain by 50% compared to ordinary glass.
Low-E 366 (balanced solar control)
Low-E 366 provides a high level of year-round comfort and excellent energy savings. Its coating offers an ideal balance of solar control and high visibility. Blocking up to 95% of the sun’s damaging rays, Low-E glass sets a new standard in energy performance for windows.
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