How to Read SHGC Ratings When Choosing New Windows

Understanding the various ratings and terminologies can make selecting new windows for your home less daunting. Among the important metrics to comprehend is the Solar Heat Gain Coefficient (SHGC). This blog post will decode SHGC ratings, providing you with the knowledge to choose windows that enhance comfort and energy efficiency.

What Is SHGC?

SHGC measures the fraction of solar radiation admitted through a window, either transmitted directly and/or absorbed, and subsequently released inward. Ratings range from 0 to 1, with lower values indicating less solar heat transfer. 

The Importance of Low SHGC

In warmer, sunny climates, windows with a low SHGC rating are advantageous. They reduce solar heat gain, helping to maintain cooler indoor temperatures without overburdening air conditioning systems. This is critical during the peak summer months when the sun is most intense. For regions, opting for windows with SHGC values of 0.25 or lower can contribute to enhanced energy efficiency and comfort.

Balancing SHGC With Other Window Ratings

While SHGC is a critical factor, it’s important to consider it alongside other window efficiency ratings like the U-factor, which measures the window’s insulating ability. Ideally, choose windows that offer both low U-factor for insulation against heat loss during cooler months and low SHGC to minimize summer heat gain. 

The Relationship Between SHGC and Visible Transmittance

Another factor to consider is visible transmittance (VT), which indicates the amount of visible light the glass allows through. While SHGC focuses on solar heat gain, VT affects daylighting and potential glare. Balancing SHGC and VT ensures windows provide adequate natural light without excessive heat gain, enhancing the overall efficiency and livability of your space.

SHGC Recommendations

If you live in a coastal area, prioritizing windows with a SHGC rating of 0.25 or less is sensible. Such windows offer a good balance between reducing unwanted solar heat and allowing enough natural light, crucial for optimizing energy consumption and improving indoor comfort. It’s also advisable to consult a local expert to understand specific needs based on your home’s orientation, shading, and architectural design.

Choosing windows with the appropriate SHGC rating can significantly affect your home’s energy efficiency and comfort levels. To ensure your window selections align with your energy efficiency goals and your area’s unique climate considerations, don’t hesitate to consult our expert team at Better View Windows and More. Call us today at (757) 540-3912 or visit our contact page to schedule an appointment!