Low-E glass: what are the benefits & how to pick it out
The right windows and doors can help make a home feel great, last longer, and operate more efficiently. But to choose well, it’s important to understand the role of low-emissivity (Low-E) glass coatings, including how they work, the benefits they provide, and the options available to achieve the right level of performance. Consider this your primer.
What is Low-E glass?
Low-E glass is window and door glass with microscopic, generally transparent coatings (Low-E coatings) that help to improve energy efficiency. These coatings can help block the sun’s heat in summer and prevent heat from escaping in winter. Whatever your climate demands — heating, cooling, or both — there are Low-E coatings available to help improve energy performance. Low-E coatings are widely available across the window and door industry, but not every company offers the option to add Low-E coatings standard with all their products, as we do.
What are the benefits of Low-E glass?
Low-E glass helps make a home feel more comfortable and improve its efficiency. Certain Low-E coatings can also help reduce fading to flooring, fabrics, and other interior surfaces by reducing the amount of UV light that transmits through the glass. While reducing unwanted temperature fluctuations and UV rays, Low-E glass still allows in the light. Finally, Low-E glass can help windows and doors achieve the level of performance prescribed by code and by voluntary programs, like ENERGY STAR®.
How does Low-E glass work?
Metallic-based Low-E coatings help reflect heat, keeping it on the side of the glass where it originated. Coatings can be applied on multiple glass surfaces of an insulated glass unit (IGU). An IGU is two or more panes of glass sealed together with air spaces in between (see image below). We offer four “soft” coatings, which are applied to glass surfaces inside the IGU, while the “hard” coating we offer, called HeatLock® technology, is applied to the interior-side glass surface. Soft and hard coatings can also be combined to achieve the performance needed — see the next section for recommended options by climate.
Which Low-E glass works best in which climates?
Some coatings are better at insulating, making them more ideal glass options for northern climates, while others are better at blocking solar heat gain, making them ideal glass options for southern climates. There are also coatings that work in all climates, and then there’s our SmartSun™ glass, which works in both northern and southern climates while also blocking UV rays. All of this is to say that the best performing Low-E glass depends on the home’s location, as well as the home’s design and orientation, and the homeowner’s preferences. And often, the best performance for the situation is achieved by combining the correct soft Low-E coating with our hard Low-E coating, HeatLock technology. Here’s what you need to know to pick the right Low-E glass option for your project:
Low-E coatings for all climates
- Low-E4® glass is a good option in most applications because it helps reflect heat in the summer and helps keep heat inside in winter. This makes it ideal in any climate where both heating and cooling costs are experienced. It’s our trademarked Low-E glass construction and available on all our products.
- SmartSun™ glass gives the benefits of Low-E4 glass while also blocking 95% of UV rays. This makes it a good option in all climates, particularly the sunny West and mild South. It’s also ideally suited to spaces with direct sun exposure, such as southern or western-facing rooms. Find it available on all our products.
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