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If sunlight has started bleaching a hardwood floor, fading a sofa or changing the color of artwork near a window, the glass may be part of the problem. Ultraviolet radiation passes through ordinary window glass and contributes to fading over time.Low-E glass reduces that exposure while still allowing natural light into the home. The right coating can also improve window energy performance, making it a practical upgrade for homeowners replacing aging or inefficient windows.If you are noticing faded furnishings alongside drafts or high energy costs, upgrading your window glass can help. Schedule a free in-home consultation with Renewal by Andersen for a full window assessment and custom project quote.
Does Low-E glass stop UV damage on floors?
Low-E glass does not eliminate every source of fading, but it significantly reduces UV exposure through windows. Some Low-E coatings are designed to block a high percentage of harmful UV rays while allowing visible light into the room. This can slow fading of hardwood floors, furniture, rugs, drapes and artwork.
Why does sunlight fade floors and furniture?
Sunlight contains ultraviolet radiation, visible light and infrared radiation. UV exposure is one contributor to fading and deterioration of interior materials, although it is not the only one.
Renewal by Andersen‘s glossary defines ultraviolet light as solar radiation that can contribute to “fading of wood, fabrics, and other surfaces.” It also notes that Low-E coatings can be added to glazing to moderate or eliminate unwanted UV wavelengths.
That distinction is useful when evaluating replacement windows. A window with UV protection can reduce exposure, but it cannot guarantee that hardwood, fabric or artwork will never fade.
How does Low-E glass protect against UV damage?
Low-E coatings are extremely thin layers applied to glass that alter how radiation passes through the window. Their primary purpose is controlling heat transfer, but certain coatings also provide substantial UV protection.
The U.S. Department of Energy (DOE) says low-emissivity glass coatings can reflect ultraviolet light away from the home and protect furnishings from UV-induced fading. A DOE guide states that this protection can reduce UV-related fading by as much as 75%, depending on the window and coating.
The National Fenestration Rating Council similarly says Low-E coatings reduce damage to interior surfaces such as rugs and furniture from UV light.
That means Low-E glass serves two purposes homeowners often consider separately: energy performance and interior protection.Related: Double-Pane vs. Triple-Pane Windows: Is Argon the Sweet Spot for Energy Savings?
What does Low-E actually do?
Low-E coatings control radiant heat while allowing visible light to pass through. The exact performance depends on the coating and window configuration.
Primary function
Low-E coating
Reduces heat transfer and UV exposure
Adds an insulating glass layer
Triple-pane glass
Provides additional insulation
Reduces solar heat gain
UV-blocking Low-E glass
Helps slow fading of furnishings
The DOE notes that low-E coatings are available with different solar-gain characteristics. Choosing the right combination depends partly on climate and how much solar heat a home receives.
Which Low-E glass blocks the most UV rays?
Renewal by Andersen‘s glass options have different levels of UV protection. Its High-Performance Low-E4 SmartSun glass is advertised as blocking 95% of harmful UV rays, while its Low-E4 glass blocks 84%.
That difference is worth considering if UV protection is a major reason for replacing your windows.
Renewal by Andersen describes SmartSun glass as an option that can protect drapes, artwork and furniture from damaging UV exposure while still allowing natural light into the home.
Low-E4 vs. SmartSun Glass
The choice is not simply about selecting the highest UV-blocking number. Glass performance also involves U-factor, solar heat gain coefficient (SHGC), visible light transmission and climate.
UV protection
Low-E4
Balanced heating and cooling performance
Blocks 95% of harmful UV rays
Triple-pane with Low-E
Additional insulation in colder climates
The right glass depends on the window’s orientation, climate and the room’s exposure to direct sunlight. A south- or west-facing room with large windows may have different needs from a shaded north-facing room.Related: How Long Does It Take New Windows To Pay for Themselves? A Realistic ROI Timeline
Can Low-E windows prevent hardwood floors from fading?
Low-E windows can reduce UV exposure and slow fading, but they cannot completely prevent color changes.
Hardwood, carpets, rugs and furniture are exposed to more than UV radiation. Visible light and heat can also contribute to changes in materials over time. The National Fenestration Rating Council specifically notes that Low-E coatings reduce UV-related damage to interior surfaces, while Renewal by Andersen identifies floors among the surfaces that can experience fading from harmful UV rays.
Homeowners can further reduce exposure by using interior shades, curtains or blinds when direct sunlight is strongest and periodically moving rugs and furniture so one area does not receive all of the exposure.If you are seeing fading alongside drafts, cold spots or high heating and cooling costs, a professional assessment from Renewal by Andersen can determine whether replacing the glass alone is practical or whether the entire window needs to be replaced.
When should you consider replacing the windows?
UV protection is only one reason to consider replacement. Older windows may also have drafts, deteriorating seals, inefficient glass or poor insulation.
If your windows are difficult to operate, have visible seal failure or create noticeable temperature differences around the room, replacing the entire window may provide benefits beyond protecting furnishings.
Energy-efficient windows combine several technologies rather than relying on Low-E coating alone. The DOE identifies multiple panes, Low-E coatings, insulating gas and improved frames as features that can reduce heat transfer.
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Are energy-efficient windows worth it for UV protection?
For homeowners concerned about fading, Low-E glass offers a way to reduce UV exposure without giving up natural light. The amount of protection depends on the specific coating and window configuration, so comparing the glass specifications is more useful than simply looking for a “Low-E” label.
Renewal by Andersen‘s current glass information identifies Low-E4 and SmartSun as options with different levels of UV protection, while DOE and NFRC guidance confirms that Low-E coatings can reduce UV-related fading.
If your floors, furniture or artwork are already showing uneven fading, replacing windows with higher-performance glass may be one part of a broader strategy to limit additional exposure.
Renewal by Andersen offers a free in-home consultation and custom window assessment. A design consultant can evaluate your existing windows, discuss glass options and provide a project quote based on your home.
This article was drafted with the assistance of AI and thoroughly reviewed, edited, and fact-checked by Parade editors. See our complete AI Policy.
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