Blackstone Exteriors

Are you considering new windows for your home? If so, you’ve probably come across the term SHGC rating and wondered what it means. To help you make the best decisions for your window replacement, Blackstone Exteriors, a trusted professional window and siding contractor, shares what you need to know about the SHGC ratings of windows.

What Is an SHGC Rating?

Solar heat gain coefficient (SHGC) is a measure of how much solar radiation a window allows into your home. The lower the SHGC, the less solar heat it transmits. This is particularly critical when you’re striving for energy efficiency and comfort in your home. By choosing the right SHGC rating for your new windows, you can help regulate your home’s temperature and make your energy bills more affordable.

Considerations for Choosing SHGC Ratings for New Windows

Climate

The climate of your location plays a significant role in determining the ideal SHGC rating. In hot and sunny climates, like the southern United States, you’ll want windows with a low SHGC rating to block excessive solar heat. In colder or moderate climates, you might prefer windows with a slightly higher SHGC rating to allow some solar heat gain for passive heating during colder months.

Window Orientation

The direction your windows face affects their exposure to the sun. South-facing windows receive more direct sunlight, so lower SHGC ratings are generally preferred to prevent overheating in warmer climates. North-facing windows receive less direct sunlight, and slightly higher SHGC ratings can be used to capture more solar heat in colder climates.

Insulation and Air Leakage

High-quality windows with proper insulation and minimal air leakage help maintain indoor temperatures and reduce the impact of SHGC. Look for windows with good insulation properties and consider professional installation to ensure a tight seal.

Shading and Overhangs

Consider the presence of shading elements like trees, awnings or building overhangs. These features can

reduce direct sunlight exposure and influence the appropriate SHGC rating for your windows.

Glazing Type

Different glazing options, such as single-pane, double-pane, or low-emissivity (low-E) coatings, affect a window’s SHGC rating. Low-E coatings can help control solar heat gain without compromising visible light transmission.

What Is the Ideal SHGC Rating for Your Windows?

Typically, SHGC ratings range from 0 to 1. Windows with a low SHGC (below 0.3) are excellent for warmer, sunnier climates as they keep out much of the sun’s heat. Conversely, if you live in a cooler climate, higher SHGC-rated windows (above 0.55) can help you take advantage of the sun’s heat during colder months.

Let Us Help You Find the Best Windows for Your Home

At Blackstone Exteriors, we can evaluate your home’s specific conditions and provide you with options to choose from. Whether it’s window installation, siding replacement, or roof replacement, you trust us for the best solutions for your home. Call us at (515) 720-2158 or fill out our contact form to schedule a consultation.