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Residential Windows, Doors and Skylights

Current Specification Effective Date: January 1, 2015

  • The current criteria were finalized in January 2014.
  • New performance levels (PDF, 238.86 KB) are effective as of January 1, 2016 for windows, doors, and skylights in all climate zones.
  • Windows, doors and skylights must meet U-Factor and, where applicable, Solar Heat Gain Coefficient (SHGC) requirements based on climate zone. In addition, doors must meet U-Factor and, where applicable, SHGC requirements based on glazing level (amount of glass).
  • Windows, doors and skylights originally qualified for the ENERGY STAR label in March, 1998.

What should I look for when buying windows, doors skylights?

Every ENERGY STAR window, door and skylight is independently certified and verified to perform at levels that meet or exceed energy efficiency guidelines set by the U.S. EPA. But how do you know which windows work in your climate? The following tips will help you buy with confidence.

Purchasing Tips

Shopping for new windows, doors, and skylights can be a confusing process. ENERGY STAR makes it simple! Follow these five tips to ensure your windows, doors, and skylights deliver savings and comfort you’ll enjoy.

Look for the ENERGY STAR label for your climate zone. All ENERGY STAR certified products must display the ENERGY STAR label. Check the label to make sure the product you are considering is certified to meet the criteria for your area. The ENERGY STAR label appears on the product next to the National Fenestration Rating Council (NFRC) label:

in Highlighted Regions

Official ENERGY STAR label (and NFRC Label) for a window qualifying in the Northern and North-Central climate zones.

in All 50 States

Ask for ENERGY STAR when ordering. When you’re ordering in a showroom, make sure to ask for a product that is certified to meet the ENERGY STAR criteria for your climate zone. You can choose ENERGY STAR certified windows in a variety of framing materials to suit your needs.

  • Get a deal. In addition to the long-term energy savings you’ll enjoy, you may be able to take advantage of financial incentives that lower your initial investment:
    • Many utilities provide financial incentives for purchasing ENERGY STAR certified windows, doors and skylights. Look for local rebates and other promotions in your area .
    • Claim federal tax credits for installing ENERGY STAR certified windows, doors or skylights or making certain other energy efficiency improvements to your home.
    • Keep in mind that the cost of complete window replacement can vary. Be sure to get quotes from several installers. Different dealers may quote difference prices for the same product. When interviewing contractors, ask them to break down the price quote by labor and materials. ENERGY STAR certified windows, doors and skylights may cost more than non-certified products, but the labor involved should be comparable for both.
    • If your house is older than 1978, be sure to look for contractors who are certified to handle lead paint .

  • Access: Clues to the functions of mammalian sleep: Nature #nature, #science, #science #news, #biology, #physics, #genetics, #astronomy, #astrophysics, #quantum #physics, #evolution, #evolutionary #biology, #geophysics, #climate #change, #earth #science, #materials #science, #interdisciplinary #science, #science #policy, #medicine, #systems #biology, #genomics, #transcriptomics, #palaeobiology, #ecology, #molecular #biology, #cancer, #immunology, #pharmacology, #development, #developmental #biology, #structural #biology, #biochemistry, #bioinformatics, #computational #biology, #nanotechnology, #proteomics, #metabolomics, #biotechnology, #drug #discovery, #environmental #science, #life, #marine #biology, #medical #research, #neuroscience, #neurobiology, #functional #genomics, #molecular #interactions, #rna, #dna, #cell #cycle, #signal #transduction, #cell #signalling




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    Review Article Clues to the functions of mammalian sleep

    Jerome M. Siegel 1


    The functions of mammalian sleep remain unclear. Most theories suggest a role for non-rapid eye movement (NREM) sleep in energy conservation and in nervous system recuperation. Theories of REM sleep have suggested a role for this state in periodic brain activation during sleep, in localized recuperative processes and in emotional regulation. Across mammals, the amount and nature of sleep are correlated with age, body size and ecological variables, such as whether the animals live in a terrestrial or an aquatic environment, their diet and the safety of their sleeping site. Sleep may be an efficient time for the completion of a number of functions, but variations in sleep expression indicate that these functions may differ across species.

    To read this story in full you will need to login or make a payment (see right).


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    Nature Medicine News and Views (01 May 2000)

    Nature Neuroscience News and Views (01 Oct 2003)

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