Categories: windows

The Importance of SHGC Ratings for Your New Windows

If you’ve been shopping around for new windows, you may have already heard the term “solar heat gain coefficient” or “SHGC” in consultation with a window contractor. Perhaps you’ve read it in brochures or on the energy performance labels affixed to replacement window units. In today’s post, local window and roof replacement company Triangle Home Exteriors explains its significance, and why it bears scrutiny when buying new windows.

Convective Heat and Solar Heat

Windows are one of the avenues where heat makes its way indoors. Other parts of the house, such as the roof and exterior walls, slow down heat transfer with insulating materials. However, the same materials are not effective on windows because they’re mostly made of glass. The prevailing solution is insulated glass, a multi-pane assembly that separates the interior and exterior surfaces of the window glass. The gap between the interior and exterior surfaces can be filled with an inert insulating gas to further slow down heat conduction.

While insulated glass is effective against convective heat — that is, heat that moves through the air — solar heat is a different matter. Being a form of light, solar heat can easily pass through any clear material, including insulated glass. To counter this, replacement window manufacturers apply coatings or film that reduce the amount of light that passes through the windows.

SHGC Ratings

Solar heat gain coefficient quantifies the heat gained through direct sunlight. SHGC ratings range from 0.0 to 1.0, with lower values signifying better heat-blocking capabilities. That is, the lower the SHGC rating, the less cooling your home will need and more comfortable you will be during the summer season.

But why should you even look at SHGC ratings at all? Shouldn’t window manufacturers just make windows with low SHGC ratings at all times? The short answer: it depends. For example, in a home that’s exposed to a cold climate all year round, windows with high SHGC ratings can help reduce their heating costs. There’s also the differences in the way window manufacturers counter solar heat. Some apply a tinted coating or film onto the glass, which can result in darker interiors. Other insulated glass products feature coatings that can selectively block solar heat and UV rays, allowing more natural light indoors.

Learn more about window ratings and how to find the right windows for your home. Give Triangle Home Exteriors a call at (919) 615-1101, or fill out our contact form to schedule a consultation. We serve Durham, NC, and the surrounding communities.

Mike Lindsey

Recent Posts

Roof Decking vs. Sheathing: What’s the Difference?

Roof decking and sheathing are unseen but critical components that serve as a backbone for…

2 days ago

Why a Local Siding Contractor Is Your Best Bet

When replacing your siding, choosing the right contractor for the job is crucial. Opting for…

6 days ago

How Natural Light Benefits Your Overall Well-Being

In bustling urban areas, the importance of integrating natural light into our living environments has…

1 month ago

Should You Worry About Granule Loss in Asphalt Shingles?

For homeowners, the roof over their heads offers more than just protection from the elements;…

1 month ago

How Much Siding Does Your Home Need?

When considering siding installation or replacement for your home, one of the primary questions that…

1 month ago

The Science Behind Noise Reduction From New Windows

The quest for tranquility within one's home has led many homeowners to explore various avenues…

2 months ago