Window Energy Ratings Explained

The following window ratings can be used to determine the efficiency of various windows and help you sort through the plethora of options available.

Window energy ratings explained.

When lower ratings mean better windows. The nfrc label provides a reliable way to determine a window s energy properties and to compare products. What makes it energy star. Find out how they can help you select the right windows for your home.

Window energy ratings explained it s important to consider how efficient your windows are if they are working correctly to keep you and your home warm. This radiation can cause your home to heat regardless of outside temperature which. The white national fenestration rating council label. No style of window is more energy efficient than the other it s the manufacturing process and how well the window overall from the frame to the glass performs this is what s important for energy efficiency and window energy rating.

Window energy ratings window energy ratings let you compare the energy efficiency of different window products. The windows you select for your home can help make a difference to the warmth and security of your living areas. The higher up the window energy rating wer label you go the more energy efficient the window will be. Are independently tested certified and verified by the national fenestration rating council nfrc and have nfrc ratings that meet strict energy efficiency guidelines set by the us environmental protection agency epa.

Solar heat gain coefficient measures how well a product can resist unwanted direct or indirect solar radiation. U factor ratings for windows generally fall between 0 20 and 1 20. Solar heat gain and u factor. Energy star qualified windows doors and skylights.

The circled value shows you the rating a door has received. The window s insulating value is indicated by the r value which is the inverse of the u value. The scheme is similar to those seen on household appliances white goods and light bulbs. Government in addition to the nfrc ratings.

Each rating is split into two values. U value sometimes called window u factor measures the rate of heat transfer it tells you how much heat is lost or gained through. Though energy star does not require any. Window energy ratings the window energy rating wer tells you how energy efficient your windows are.

The lower the u value the greater a window s resistance to heat flow and the better its insulating value. The rating system is based on a scale of e to a with a windows being the most energy efficient. Are manufactured by an energy star partner. The national fenestration rating council nfrc operates a voluntary program that tests certifies and labels windows doors and skylights based on their energy performance ratings.