How to Determine the Efficiency of Replacement Windows
How can you tell if a window is energy-efficient? Standards have been established by the National Fenestration Rating Council (NFRC), an independent, non-profit organization that administers the only nationally accepted rating system to measure the energy performance of windows, doors and skylights. The NFRC provides fair, accurate and reliable energy performance ratings, allowing architects, builders, code officials, contractors and homeowners to compare products and make informed choices.
- U-Value. The most important measure of a window’s performance is its U-value, the rate of heat flow through a window. The lower the U-value, the more energy-efficient the window will be. U-value measures the entire window unit and is the only measurement accepted by the U.S. Department of Energy’s ENERGY STAR program.
- R-Value. R-value is the measure of the resistance of glass to the flow of heat. The higher the R-value, the better the glass will be at insulating your home. However, R-value is not an accepted form of measurement by the NFRC or ENERGY STAR, as it does not measure the overall window unit.
- 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.
Trust the Window Replacement Professionals
The replacement window experts at MHx Designs are ready to help you reduce energy costs and make your home more beautiful and comfortable. Contact us for a free estimate today by calling (888) 944-6493 or completing our online quote request form.