You should use energy performance ratings of windows to tell you their potential for gaining and losing heat, as well as transmitting sunlight into your home.
Energy Performance Testing, Certification, and Labeling
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. The NFRC label provides a reliable way to determine a window’s energy properties and to compare products.
The NFRC label can be found on all ENERGY ...
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