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The 3 Most Often Asked Questions About Energy-Saving Windows

If you’re planning a window replacement this season, make sure to take into account the energy performance of your new units. After all, windows aren’t just lovely design elements that increase your home’s curb appeal – they are also great contributors to its comfort and efficiency. But many homeowners still have questions about these types of windows.



  1. What are double-pane windows? They are exactly that: windows that come with two panes of glass, plus an insulated space between. Double-pane windows are known for their thermal resistance, especially when that same insulated space is filled with insert gas. One of the better gas fills available today is argon, which is odorless, colorless and non-toxic. It creates a greater insulating barrier between outdoor temperatures and your home, ensuring a more consistent indoor environment for your living space. 


  1. What is the difference between U-Value and R-Value? When choosing replacement windows or French doors, check their U-value and R-value. The former measures how well your windows can keep out heat or cold – the lower the number, the better insulating performance your windows can provide. The latter, on the other hand, rates your windows’ ability to trap heating or cooling inside your home – the higher the number, the greater they are in preventing energy loss.


  1. What exactly is Low-E glass? This refers to window glass with low-emissivity (Low-E) coatings that reduce the transmission of ultraviolet (UV) rays into your home. At Renewal by Andersen® of San Diego, we use something better than standard Low-E glass. Our replacement windows come with exclusive High-Performance™ Low-E4® SmartSun™ glass, which reduces the amount of solar heat entering your home, keeping it cooler and more comfortable – minus the high air conditioning bills. It also cuts glare and prevents extensive sun damage to your interior furnishings.


Aside from quality sliding French patio doors, Renewal by Andersen of San Diego offers some of the highest quality replacement windows in the area. With our options, keeping your home thermally comfortable and energy-efficient in any season is worry-free. We serve Imperial Beach, Lemon Grove and the Greater San Diego, CA area. Call us today at (858) 877-5172, or fill out this contact form to schedule your consultation.