National Building Code 2020 Changes
August 13, 2026
Learn how Canada’s building code change affects combustible window frames, fiberglass windows and their use in noncombustible construction.
Understanding the Basics of...
ENERGY STAR® and NFRC
When it comes to choosing the best windows for your home, understanding the labels can make a big difference. Two of the most important labels to look for are ENERGY STAR® and NFRC. These labels provide valuable information about a window’s energy efficiency and performance.
What is ENERGY STAR®?
Windows, doors, and skylights with the ENERGY STAR® label are certified to meet strict energy efficiency standards set by the U.S. Environmental Protection Agency (EPA). To qualify for ENERGY STAR®, products must undergo independent testing and verification by the National Fenestration Rating Council (NFRC).
ENERGY STAR®-qualified windows typically feature:
- Multiple panes
- Warm edge spacers
- Gas fills
- Low-emissivity glass
- High-quality frame materials
What is NFRC?
The National Fenestration Rating Council (NFRC) is a non-profit organization that provides ratings and labels for windows, doors, and skylights. NFRC ratings help homeowners compare the performance of different products based on factors such as:
- U-factor: Measures how well a window insulates against heat transfer.
- Solar Heat Gain Coefficient (SHGC): Measures how much solar heat passes through a window.
- Air Leakage (AL): Measures how much air can pass through a window.
- Visible Transmittance (VT): Measures how much light a window allows.
- Condensation Resistance: Measures a window’s ability to resist condensation.
Choosing the Right Windows
Both ENERGY STAR® and NFRC labels provide valuable information for consumers. When selecting windows, consider your specific needs and climate. For example, in warmer climates, a lower SHGC may be desirable to reduce heat gain, while in colder climates, a higher SHGC may be beneficial for heating.
At SILEX, we are committed to helping you find the perfect windows for your home. Our experts can help you understand the benefits of ENERGY STAR® and NFRC-certified windows and recommend products that meet your specific needs. Contact us today to schedule a consultation.
