SHGC vs. U-Value: Key Differences

When you’re picking out new windows and doors for your humble abode or commercial building project, you will be required to comply with performance requirements for energy efficiency. For example, you will be asked to pick windows and doors with a specific U-value, or solar heat gain coefficient (SHGC). It could be intimidating for some people who don’t know what these terms mean, which is why we’ll help you differentiate between the two here. 

U-Value

One of the most important things to pay attention to when shopping for windows, aside from their style, is their U-value. The U-value, also known as the U-factor measures the rate your windows transfer non-solar heat. To simplify this, it quantifies the quality of insulation possessed by the windows you plan to install and how much it provides.

Window replacement contractors will tell you that the window U-rating is reflected as a number between 0.20 and 1.20. The lower your windows’ U-value is, the less heat is transferred through the glass, resulting in better insulation. Ideally, you should find windows that have the lowest U-value so that you can optimize heating and energy efficiency at home.

Solar Heat Gain Coefficient (SHGC)

The solar heat gain coefficient rating is another important detail you should pay attention to. The SHGC rating shows how much solar heat transfers into your home once it penetrates the glass. The SHGC rating is rated between 0 and 1, with lower ratings resulting in less solar heat felt in your home. Both ratings are correlated since most windows with low SHGC ratings come with a low U-value. If you want more heating, you’ll have to compromise on insulation.

You can also turn to California Energy Consultant Service for your residential window replacement and siding installation needs. Call (916) 281-0548 or fill out our contact form for a free consultation. We serve residents of Sacramento and Rancho Cordova, CA.