Triple-pane windows work best when enhanced energy performance is a key objective. Low E coatings, usually applied to the inside layers of insulating glass, manage the amount of light and heat either conducted through a window or reflected away from it.Īre triple pane windows the best? The more panes the better, right? Extremely thin coatings of special low emissivity (Low E) metallic material are applied to glass panes used in windows and doors to boost their energy efficiency. The ability of a material to radiate energy (heat) is called its emissivity. Low SHGC numbers are best for southern climates where there’s intense sun exposure, whereas higher SHGC values make the most sense for regions with cold winters. A “good” Solar Heat Gain rating, meanwhile, on a scale from 0 to 1, is relative to climates in different regions. This coating option provides better protection against radiant heat transfer than single layer metallic Low E coatings.įeatures three layers of metallic silver and provides the lowest solar heat gain performance in climates where sun exposure is intense and cooling costs are high.Ī high performance insulating glass that features a Low-E coating on the room-side glass (4th surface) and low E3 on the 2nd glass surface.Ĭan you help me to better understand the numbers? What’s a good U-factor number? What’s a good SHGC?ĭifferent homeowners seek out different levels of efficiency, but a “good” U-factor is <.30. It provides year round performance and comfort. To stay up-to-date with the latest, visit Here is a link to the Marvin Manufacturers' Certification Statement.įeatures a single layer of metallic coating, which blocks heat loss to the outside while reflecting heat back into the room.įeatures a double layer of silver on an inside surface of IG glass. See the Glossary of Terms.Īre tax credits still available for energy-saving window and door replacement? Various performance ratings – like U-factor and Solar Heat Gain Coefficient – measure a product’s effectiveness in insulating and blocking heat from the sun, among other things. How do I know if a window or a door is energy efficient?Ĭertification programs such as those administered by the National Fenestration Rating Council (NFRC) and ENERGY STAR provide ratings designed to indicate a window or door’s efficiency.
Choosing energy-efficient windows makes your home more comfortable, as their performance determines how much heat comes in and escapes out through the windows. Replacing windows with energy-efficient ones can help reduce your utility bills, but the benefits go much further.
What’s the first thing I need to know when it comes to windows and energy efficiency?
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