Home Replacement Windows: What’s Your R-Value?
Today, everyone from President Obama to Green Building Advisor Martin Holladay is talking windows – those that save money and save energy.
At a Home Depot store in Virginia, Obama explained how retrofitting buildings and investing in “energy-efficient windows and doors” is the biggest bang for the buck for economic growth, environmental initiatives and energy efficiency.
Martin posted a fantastic summary and is leading a great discussion on Windows That Perform Better Than Walls.
His technical explanations dive deep into the relationships and qualities of insulation values (R-value or U-value) and solar gain and a concept that we specialize in, and the critical art of directional “tuning” glass values based on a building’s position in relation to the sun. He discusses different standards such as Canada’s ER (Energy Rating) method and Passive House - one specifically that emphasizes the fine balance of solar energy gains and losses, super-insulation, advanced window technology, air tightness, and ventilation. Read more about Passive House here.
It is pretty simple. This chart details the amount of money you can save replacing your home’s old single pane windows (an R-value of 1.0) with other windows on the market. Super-insulating windows of higher R-values can help you save the highest percentage of heating and cooling costs when compared to other “energy-saving” windows available today. Even compared to typical ENERGY STAR® windows (they are usually dual pane low-e windows with an insulating value of R-2.5 to R-2.8 depending on geography).
The data for this chart is based on the U.S. Department of Energy’s RESFEN model and is an average taken from 5 typical cities across the U.S.:
Great post. It’s also important to note that the lower the U-value, the greater a window’s resistance to heat flow and the better its insulating value. In Mass., the state requires the U-value to be have a .35 U-Value rating for energy efficiency. Newpro has a .19 U-Value Rating.. this rating would be hard for anyone to beat. Check out our site for more information on window energy efficiency. Also, if you have time please feel free to read our blog.
http://www.newpro.com/blog
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Gary Smith
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Really cool article. I think i have to agree mostly but there are still some things i don’t agree with you on this sorry.
The energy savings of windows can be awesome! http://www.denverwindowinfo.com/goinggreen.html has some great insights on the energy efficiency ratings and more information on what you might expect in energy savings from new windows.
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Great blog, very informative. Thank you
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I tend to agree with him, but do not feel I have enough experience to speak clearly on this one. I hope to hear further discussion on this going forward.
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Yeah, windows are one of the main reasons why most homes are energy inefficient.
Yeah, windows are one of the main reasons why most homes are energy inefficient.