Low-Emissivity
Definition and meaning of Low-Emissivity in real estate.
Low-emissivity (low-E) refers to a microscopic, metallic oxide coating applied to window glass that reduces the amount of ultraviolet and infrared light passing through without blocking visible light. This technology improves a building's energy efficiency by reflecting heat back to its source.
In more detail
The coating works by keeping heat inside during the winter and reflecting outdoor heat away during the summer. This helps reduce the workload on heating and cooling systems, lowering utility bills and improving indoor comfort. The coating also protects indoor furnishings by blocking ultraviolet rays, which can cause fabrics, carpets, and wood floors to fade.
While low-E windows have a higher initial purchase price, the energy savings over time typically offset the extra upfront cost.
Key facts
| Category | Property Types & Construction |
|---|---|
| Also known as | Low-E glass |
| Primary benefit | Improved energy efficiency and UV protection |
| Applies to | Double-pane or triple-pane residential and commercial windows |
A homeowner replaces their old windows with low-emissivity glass, resulting in lower summer cooling bills and less fading on their living room carpet.
Frequently asked questions
How does low-emissivity glass save energy?
It reflects indoor heat back into the home during the winter and blocks solar heat from entering the home during the summer, reducing the energy needed for heating and air conditioning.
Can you see the low-E coating on a window?
The coating is nearly invisible to the naked eye. However, it may create a slight tint or reflection when viewed from certain angles or in specific lighting conditions.