Technical image showing how window glass can deflect UV rays.

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.

Different types of Low-E include:

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.