The Benefits of Energy Efficient Windows
Windows have undergone a technological revolution, making it possible for windows to have less air leakage, lower heat loss, and warmer surfaces that minimize condensations and improve comfort. In heating-dominated climates, depending on the glass composition and the frame, you can save anywhere from 27% to 39% on your energy bills. In cooling-dominant climates where heat gain is not wanted, energy efficient windows can significantly reduce solar heat gain and improve comfort, resulting in savings of 6% to 32% in cooling energy costs.
Learn more about how windows are rated for energy efficiency in this video by Designing Spaces:
An additional benefit of energy efficient windows is that they make your home more comfortable. Older windows feel colder in the winter because more heat radiates from your body to the window; also, as air next to the window is cooled and drops to the floor,an air movement pattern is created that feels drafty and increases heat loss. High performance windows with lower U-factors along with proper installation and weatherstripping will improve comfort. In the summertime, windows with low solar heat gain coefficients will improve comfort by reducing the solar radiation coming through the glass.
Tinted glass or shades reduce solar heat gain; however, they also reduce the amount of light. Energy efficient windows coated with low-e coatings reduce solar heat gain with a minimal loss of visible light, resulting in views that are clearer and unobstructed. Low-e coatings also reduce UV radiation, which provides the added benefit of reduced fading from sunlight of your carpeting, fabrics and furniture.
Lastly, energy efficient windows reduce peak heating and cooling loads, which is beneficial for electrical utilities as well as for homeowners. The peak load is the maximum requirement for heating or cooling at one time and determines the size of the air conditioner, fans, furnace and heat pump that must be installed. Peak load reduction means that heating and cooling systems can be sized smaller, which can result in initial cost savings for homeowners.
