Measuring The Energy Efficiency of Your Windows
Are your windows drafty? Are you experiencing extreme sunlight that is fading your furniture? Are your energy bills higher? If you answered yes to any of these questions, you may need to assess the energy efficiency of your current windows and consider replacing them with new, more efficient windows. Some products are more energy smart than others. By looking at the right factors and trusting a knowledgeable window replacement contractor like Roofing & More, you can get the most out of your investment for years to come.
The most important measure of a window’s performance is its U-Factor. The U-Factor indicates the rate of heat flow through a window. The lower the U-Factor, the more energy efficient the window will be. U-Factor measures the entire window unit — glass, frame, sash, spacers — and is the only measurement accepted by the U.S. Department of Energy’s EnergyStar program. U-Factor ratings generally fall between 0.20 and 1.20. The lower the U-value, the greater a window’s resistance to heat flow and the better its insulating value.
Solar Heat Gain Coefficient
Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat caused by sunlight. SHGC is expressed as a number between 0 and 1. The lower a window’s solar heat gain coefficient, the less solar heat it transmits in the house. What does this mean for you? No more hot sun coming through the window that requires you to run the AC a little colder.
Visible Transmittance (VT) measures how much light comes through a window’s glass package. The visible transmittance is an optical property that indicates the amount of visible light transmitted. VT is expressed as a number between 0 and 1. The higher the VT, the more light is transmitted. Roofing & More offers windows with very low visible transmittance, so light doesn’t come through the windows and fade your floors, furniture and window dressings.
The lower a window’s air leakage rating, the less air will pass through cracks in the window assembly. Our windows achieve some of the lowest AL ratings on the market.
Have you ever noticed water droplets forming on interior window glass? Condensation Resistance (CR) measures the ability of a window to resist the formation of condensation on the interior surface of that window. The higher the CR rating, the better that product is at resisting condensation formation. CR is expressed as a number between 0 and 100. We make sure our customers understand the importance of choosing a window with a low CR rating.
If you are considering replacing the windows in your home in Arlington, Alexandria, Herndon, Chantilly, or Sterling your first step should be to call or contact Roofing & More for a free, no obligation estimate. We’ll go over your window options and help you make the right decision for the long-term safety and comfort of your family.