The latest technological advance in window manufacturing is low-emissivity coating or Low-E coatings. Plainly put, a Low-E coating is a thin layer of either molten tin or silver that is applied to the outer part of the glass window. This coating bounces heat off of it from both from the inside and the outside. This works to keep your house cooler in the summer since the heat from the exterior of your home will bounce of the window on the outside and warmer in the winter since heat bounces off of the window from the inside and goes back into your room rather than to the outdoors.
Types of Low-E
The two different types of Low-E glass include hard Low-E and soft Low-E. Hard Low-E glass is made from molten tin that is poured onto the glass when the glass is still hot and before the tin has completely hardened to create its molten state on the window. This process causes the tin to weld to the glass, giving it the reflective properties that it needs to become Low-E glass.
Soft Low-E glass is applied to the glass after the glass is made and cooled and is done in a vacuum. The glass is put into a vacuum chamber and metallic droplets are added to the glass in an electrically charged vacuum chamber.
Which is Better Hard Low-E or Soft Low-E?
Hard coating Low-E windows are very durable because the coating is fused with the window during manufacturing however it isn’t as energy efficient as soft coating Low-E windows. Soft coating Low-E windows are more delicate in nature but are more efficient at reflecting heat off of the window.
Windows play a large part in energy loss during the winter, which makes investing in energy efficient windows very beneficial. Since Low-E windows help to reduce the loss of heat in the winter and the gain of heat in the summer, they can help reduce your energy bills during both of the most expensive seasons in regards to your energy bills.