Energy Star 7.0 - Updated Criteria for Windows & Doors
Where does Energy Star come from?
The Environmental Protection Agency (EPA) administers this government backed rating system that gives consumers an unbiased standard to go off when purchasing products for a home or building. The energy star label is different than the NFRC sticker. Windows are just one of the many products within a home that you can find energy star labels for. The new criteria (version 7.0) for energy star windows and doors represents an improvement of thermal performance. Which means lower u-values and slightly lower SHGC. This new version goes into effect on OCTOBER 23, 2023. This means that window manufactures will need to specify which windows qualify and which do not qualify to the new standard starting on October 23rd.
Most are familiar with the term “energy star windows” - but what does that really mean?
The new energy performance requirements for each climate zone are outlined below. Notice that climate zone 4 has a prescriptive method allowing for more flexibility when picking windows in this climate zone. Allow me to explain this feature. The higher the U-factor is, the higher the SHGC must be. This is because you are making the window less insulated. However, at the same time you are allowing more solar heat in to "even it out". Take the first row for example; if you a U-factor or .22 or less then your solar heat gain must be .17 or greater. On the flip side if you have a U-factor of .26 and a SHGC of .50 (letting in 50% of the solar heat) or greater, then the window would also be energy star certified.
Can you buy Energy Star windows with only dual pane glass?
Quick note on federal tax credits… to qualify for the window credit, the windows MUST be Energy star rated for your specific climate zone. READ HERE for more information regarding federal tax credit incentives.
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