Low-E glass reduces harmful UV rays that cause fading. Meets ENERGY STAR certification requirements in northern and north-central climate zones. Adding an insulating layer reduces drafts up to 40% by mounting over existing window to create a thermal barrier. Weatherstrip blocks drafts and reduces air infiltration. Bottom expander adjusts for a tight fit. Half screen included for easy ventilation. Glass and screen are removable for easy cleaning. The Attachment Energy Rating Council certifies this product s energy performance and rates as 69 out of a possible 110 in a dominantly cool climate and 24 out of a possible 55 in a dominantly warm climate.
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