One of the major performance rating categories listed on an NFRC label is the U-Factor, which is also sometimes called the U-Value. This category measures the rate of heat transfer from the inside of a home to the outside. While the scientific measurements that go into calculating a U-Factor can be rather complex, all that a homeowner really needs to know is that a lower U-Factor means that less heat will be able to pass through the glass.
The ENERGY STAR® standards for U-Factors vary slightly from region to region, so determining what would be an ideal U-Factor for your home depends on which part of the country you live in. In the northern part of the United States, energy-efficient windows often have U-Factors that are as low as 0.17. This is because the less heat that is able to escape, the easier it will be for the home to stay warm during the colder months. However, in the southern states, where the climate is generally much warmer and the majority of home energy usage is for keeping homes cooler against a warm outside temperature, U-Factors as high as 0.30 are not uncommon.
Sunrise Windows offers high-performing vinyl replacement windows that feature either double- or triple-pane glazing systems and are equipped with inert gas fills for superior insulation that will help prevent unwanted heat transfer into and out of your home. Our windows boast some of the lowest U-Factors in the industry and can be customized to perform ideally in your local climate, whether it’s hot, cold, or somewhere in between.
For more information about how a replacement window’s U-factor can affect your home’s energy performance, click here to locate a Sunrise Windows dealer in your area.