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Understanding Energy Performance Ratings

When shopping for replacement windows, it’s important for homeowners to evaluate their energy performance ratings. There are countless options out there, but there are always more efficient options when it comes to gaining and losing heat. This is an incredibly important feature to consider when comparing window properties.

The National Fenestration Rating Council (NFRC) has made it easier for homeowners to evaluate the energy efficiency of windows. They do the testing, certifying, and labeling of various types of windows according to their energy performance ratings. This makes it more convenient for homeowners to choose the right windows that suit their needs.

Why Choose Energy-Efficient Windows?

Not every region in the US has the same climate, so checking the energy efficiency rating of replacement windows ensures that what you buy can perform well according to your specific climate. In Oklahoma, for example, the climate varies from humid in the eastern portion to semi-arid in the western portion. With this subtropical climate, we’d want windows that can protect our homes from the heat and only allow enough of it to pass through.

When you have the right windows for your home, you get to maintain a consistent temperature indoors. This lessens the strain on your heating, ventilation, and air conditioning (HVAC) systems, particularly on very hot days or extremely cold nights. This results in significantly greater energy savings, reducing your monthly expenses.

How Is the Energy Efficiency of Window Replacements Measured?

Choosing energy-efficient windows is important because it helps you exercise control over your energy costs. However, it takes more than just putting a label on a window replacement to provide a classification.

The NFRC measures five factors that influence a window replacement’s level of energy efficiency:

  • U-Factor: This factor measures how well a window can prevent heat from escaping the house. The range varies from 0.15 to 1.20. The lower the value, the more effective the window is at keeping heat inside.
  • Solar Heat Gain Coefficient (SHGC): This factor measures how well a window can prevent heat from entering the house. The range varies from 0 to 1. The lower the value, the more effective the window is at stopping heat from outside.
  • Air Leakage: This factor measures how much air can enter the house. The range varies from 0.1 to 0.3. The lower the value, the more effective the window is at keeping air out.
  • Visible Transmittance (VT): This factor measures how well daylight can pass through the glass of a window. The range varies from 0 to 1. The higher the value, the more effective the window is at letting light into the house. The lower the value, the dimmer the house will be.
  • Condensation Resistance: This factor measures how much moisture can build up on the glass of a window. The range varies from 1 to 100. The lower the value, the more likely a window is to let condensation form on the surface.

Choose the Right Window Replacement

With all these energy efficiency ratings measured by the NFRC, there’s no excuse to buy the wrong window replacement for your home.

At Red Oak Home Exteriors, we’re proud to offer high-quality window replacements. Make a wise choice when shopping for affordable, high-performing windows. Our Energy Star-qualified windows can help you save money. Homes deserve nothing less.

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